essay on how to reduce global warming

Essay on Prevention of Global Warming for Students and Children

500 words essay on prevention of global warming.

Global warming is a term you must have heard by now as it is very prevalent in today’s world. Moreover, it has become a very dangerous environmental issue which we must resolve as soon as possible. If we do not prevent it now, soon we will find it hard to survive on this planet.

Every person needs to contribute equally to help prevent global warming. Similarly, we must identify the causes that are contributing to this dangerous phenomenon and work hard to find solutions. Furthermore, we must immediately put a halt to all those activities which are causing global warming .

Causes of Global Warming

There are many activities through which global warming is happening. Mostly human activities are contributing to this damaging phenomenon. The carbon dioxide levels are increasing in the air which is causing global warming. Moreover, the increase in greenhouse gases is also contributing to this phenomenon.

Furthermore, the usages of hot water for various purposes like bathing, cleaning and more release gases contribute to it. After that, when we make use of ordinary bulbs instead of LED lights, we contribute majorly to global warming. Similarly, the way people leave their electronic devices unattended when not in use also plays a big role.

Most importantly, deforestation and cutting plants everywhere just make it worse for our planet. The way we burn wood and fossil fuels only makes the condition of global warming worse. Similarly, when we use too much of automobiles that release harmful toxins in the air, the temperature of earth increases and causes global warming. In order to prevent global warming, we must adopt an eco-friendly lifestyle to make the future safe for our future generations.

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Ways to Prevent Global Warming

There are many changes we can bring about in our life both big and small to prevent global warming and save our planet. Firstly, we must stop deforestation in all forms. Do not cut down more trees as it will only worsen the level of carbon dioxide in the air. Instead, encourage people to plant even more trees to create a fine balance in nature.

Moreover, it reduces the usage of energy everywhere. It does not matter if you are at your home or at your office, the higher the energy used the more the carbon dioxide produced. Thus, do not waste electricity as it requires the burning of fossil fuels. As a result of the burning of fossil fuels , greenhouse gases in the atmosphere increase rapidly and contribute to global warming. Moreover, reduce the carbon footprint and do not travel through planes that often.

Most importantly, replace all your ordinary bulbs with LED lights. It will help in reducing the use of energy by a massive amount. Similarly, do not waste that energy. Instead of becoming more dependent, we need to reduce our dependence on fossil fuels and electricity right away.

Opt for eco-friendly options like solar energy and win power. Take up the habit of recycling and reusing. Do not throw away things instead learn to reuse them properly. Further, carpool with your neighbors and relatives to not contribute to automobile exhausts and emissions.

FAQs on Prevention of Global Warming

Q.1 What is causing global warming?

A.1 There are many human activities that cause global warming. Some of them are the usage of hot water, old light bulbs, burning fossil fuels, wasting electricity, using excessive automobiles, deforestation and many more.

Q.2 How can we prevent global warming?

A.2 We can prevent global warming by adopting a healthy lifestyle. Try to carpool with your relatives and friends to not produce carbon emissions. Moreover, do not cut down trees unnecessarily and also replace old electronic gadgets.

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1. Spread the word

Encourage your friends, family and co-workers to reduce their carbon pollution. Join a global movement like  Count Us In, which aims to inspire 1 billion people to take practical steps and challenge their leaders to act more boldly on climate. Organizers of the platform say that if 1 billion people took action, they could reduce as much as 20 per cent of global carbon emissions. Or you could sign up to the UN’s  #ActNow campaign on climate change and sustainability and add your voice to this critical global debate.

2. Keep up the political pressure

Lobby local politicians and businesses to support efforts to cut emissions and reduce carbon pollution.  #ActNow Speak Up  has sections on political pressure and corporate action - and Count Us In also has  some handy tips  for how to do this. Pick an environmental issue you care about, decide on a specific request for change and then try to arrange a meeting with your local representative. It might seem intimidating but your voice deserves to be heard. If humanity is to succeed in tackling the climate emergency, politicians must be part of the solution. It’s up to all of us to keep up with the pressure. 

3. Transform your transport

Transport accounts for around a quarter of all greenhouse gas emissions and across the world, many governments are implementing policies to decarbonize travel. You can get a head start: leave your car at home and walk or cycle whenever possible. If the distances are too great, choose public transport, preferably electric options. If you must drive, offer to carpool with others so that fewer cars are on the road. Get ahead of the curve and buy an electric car. Reduce the number of long-haul flights you take. 

4. Rein in your power use

If you can, switch to a zero-carbon or renewable energy provider. Install solar panels on your roof. Be more efficient: turn your heating down a degree or two, if possible. Switch off appliances and lights when you are not using them and better yet buy the most efficient products in the first place (hint: this will save you money!). Insulate your loft or roof: you’ll be warmer in the winter, cooler in the summer and save some money too. 

5. Tweak your diet

Eat more plant-based meals – your body and the planet will thank you. Today, around 60 per cent of the world’s agricultural land is used for livestock grazing and people in many countries are consuming more animal-sourced food than is healthy. Plant-rich diets can help reduce chronic illnesses, such as heart disease, stroke, diabetes and cancer.

The climate emergency demands action from all of us. We need to get to net zero greenhouse gas emissions by 2050 and everyone has a role to play.

6. Shop local and buy sustainable

To reduce your food’s carbon footprint, buy local and seasonal foods. You’ll be helping small businesses and farms in your area and reducing fossil fuel emissions associated with transport and cold chain storage. Sustainable agriculture uses up to 56 per cent less energy, creates 64 per cent fewer emissions and allows for greater levels of biodiversity than conventional farming. Go one step further and try growing your own fruit, vegetables and herbs. You can plant them in a garden, on a balcony or even on a window sill. Set up a community garden in your neighbourhood to get others involved. 

7. Don’t waste food

One-third of all food produced is either lost or wasted. According to UNEP’s  Food Waste Index Report 2021 , people globally waste 1 billion tonnes of food each year, which accounts for around 8-10 per cent of global greenhouse gas emissions. Avoid waste by only buying what you need. Take advantage of every edible part of the foods you purchase. Measure portion sizes of rice and other staples before cooking them, store food correctly (use your freezer if you have one), be creative with leftovers, share extras with your friends and neighbours and contribute to a local food-sharing scheme. Make compost out of inedible remnants and use it to fertilize your garden. Composting is one of the best options for managing organic waste while also reducing environmental impacts.

8. Dress (climate) smart

The fashion industry accounts for 8-10 per cent of global carbon emissions – more than all international flights and maritime shipping combined – and ‘fast fashion’ has created a throwaway culture that sees clothes quickly end up in landfills. But we can change this. Buy fewer new clothes and wear them longer. Seek out sustainable labels and use rental services for special occasions rather than buying new items that will only be worn once. Recycle pre-loved clothes and repair when necessary.

9. Plant trees  

Every year approximately 12 million hectares of forest are destroyed and this deforestation, together with agriculture and other land use changes, is responsible for roughly 25 per cent of global greenhouse gas emissions. We can all play a part in reversing this trend by planting trees, either individually or as part of a collective. For example, the Plant-for-the-Planet initiative allows people to sponsor tree-planting around the world.

Check out this UNEP guide to see what else you can do as part of the UN Decade on Ecosystem Restoration , a global drive to halt the degradation of land and oceans, protect biodiversity, and rebuild ecosystems. 

10. Focus on planet-friendly investments

Individuals can also spur change through their savings and investments by choosing financial institutions that do not invest in carbon-polluting industries. #ActNow Speak Up  has a section on money and so does  Count Us In . This sends a clear signal to the market and already many financial institutions are offering more ethical investments, allowing you to use your money to support causes you believe in and avoid those you don’t. You can ask your financial institution about their responsible banking policies and find out how they rank in independent research. 

UNEP is at the front in support of the Paris Agreement goal of keeping the global temperature rise well below 2°C, and aiming - to be safe - for 1.5°C, compared to pre-industrial levels. To do this, UNEP has developed a Six-Sector Solution . The Six Sector Solution is a roadmap to reducing emissions across sectors in line with the Paris Agreement commitments and in pursuit of climate stability. The six sectors identified are Energy; Industry; Agriculture & Food; Forests & Land Use; Transport; and Buildings & Cities.

• Clean fuels
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• Sustainable Development

Further Resources

• 7 climate action highlights to remember before COP26
• Climate Action Note - data you need to know
• Emissions Gap Report 2021
• Food Waste Index 2021
• Act Now: the UN campaign for individual action
• Count Us In
• Food Loss and Waste Website

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How You Can Stop Global Warming

Healing the planet starts in your garage, in your kitchen, and at your dining room table.

Weatherizing doors and windows by sealing drafts can make your home more energy efficient.

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Rising sea levels. Raging storms. Searing heat. Ferocious fires. Severe drought. Punishing floods. The effects of climate change are already threatening our health, our communities, our economy, our security, and our children’s future.

What can you do? A whole lot, as it turns out. Americans, on average, produce 21 tons of carbon a year, about four times the global average. Personal action is, of course, no substitute for meaningful government policies. We still must limit carbon pollution and aggressively move away from dirty fossil fuels toward cleaner power.

But it’s important to remember the equally vital contributions that can be made by private citizens—which is to say, by you. “Change only happens when individuals take action,” says clean energy advocate Aliya Haq. “There’s no other way, if it doesn’t start with people.”

Here are a dozen easy, effective ways each one of us can make a difference.

1. Speak up!

What’s the single biggest way you can make an impact on global climate change? “Talk to your friends and family, and make sure your representatives are making good decisions,” Haq says. By voicing your concerns—via social media or, better yet, directly to your elected officials —you send a message that you care about the warming world. Encourage Congress to enact new laws that limit carbon emissions and require polluters to pay for the emissions they produce. “The main reason elected officials do anything difficult is because their constituents make them,” Haq says. You can help protect public lands, stop offshore drilling, and more here .

2. Power your home with renewable energy.

Choose a utility company that generates at least half its power from wind or solar and has been certified by Green-e Energy , an organization that vets renewable energy options. If that isn’t possible for you, take a look at your electric bill; many utilities now list other ways to support renewable sources on their monthly statements and websites.

3. Weatherize, weatherize, weatherize.

“Building heating and cooling are among the biggest uses of energy,” Haq says. Indeed, heating and air-conditioning account for almost half of home energy use. You can make your space more energy efficient by sealing drafts and ensuring it’s adequately insulated. You can also claim federal tax credits for many energy efficiency home improvements. To help you figure out where to start, you could also get a home energy audit, which some utilities offer free of charge. (Alternatively, you can hire a professional to come to your home and perform one; the Inflation Reduction Act offers a partial tax credit for this.) The EPA’s Home Energy Yardstick gives you a simple assessment of your home’s annual energy use compared with similar homes.

4. Invest in energy-efficient appliances.

Since they were first implemented nationally in 1987, efficiency standards for dozens of appliances and products have kept 2.3 billion tons of carbon dioxide out of the air. That’s about the same amount as the annual carbon pollution coughed up by nearly 440 million cars. “Energy efficiency is the lowest-cost way to reduce emissions,” Haq says. When shopping for refrigerators, washing machines, heat pump water heaters , and other appliances, look for the Energy Star label. It will tell you which are the most efficient. (There may also be rebates to earn from your purchase of Energy Star–certified products.)

And when you’re ready to swap out your old machines, don’t just put them on the curb: Recycling an old refrigerator through the EPA’s Responsible Appliance Disposal Program can prevent an additional 10,000 pounds of carbon pollution because the global-warming pollutants in the refrigerants and foam would be properly captured rather than vented to the air.

5. Reduce water waste.

Saving water reduces carbon pollution, too. That's because it takes a lot of energy to pump, heat, and treat your water. So take shorter showers, turn off the tap while brushing your teeth, and switch to WaterSense -labeled fixtures and appliances. The EPA estimates that if just one out of every 100 American homes were retrofitted with water-efficient fixtures, about 100 million kilowatt-hours of electricity per year would be saved—avoiding 80,000 tons of global warming pollution .

6. Actually eat the food you buy—and compost what you can’t.

Approximately 10 percent of U.S. energy use goes into growing, processing, packaging, and shipping food—about 40 percent of which winds up in the landfill. “If you’re wasting less food, you’re likely cutting down on energy consumption,” Haq says. As for the scraps you can’t eat or the leftovers you don’t get to, collect them in a compost bin instead of sending them to the landfill where they release methane. Recycling food and other organic waste into compost provides a range of environmental benefits, including improving soil health, reducing greenhouse gas emissions, recycling nutrients, and mitigating the impact of droughts.

7. Buy better bulbs.

LED light bulbs use one-sixth the amount of energy to deliver the same amount of light as conventional incandescents and last at least 10 times longer. They’re also cheaper in the long run: A 10-watt LED that replaces your traditional 60-watt bulb will save you $125 over the light bulb’s life. And because the average American home has around 40 to 50 light bulbs, this is a simple swap that will reap huge rewards. If every household in the United States replaced just one incandescent with an Energy Star–labeled LED, we would prevent seven billion pounds of carbon pollution per year. That’s equivalent to the emissions of about 648,000 cars.

8. Pull the plug(s).

Taken together, the outlets in your home are likely powering about 65 devices—an average load for a home in the United States. Audio and video devices, cordless vacuums and power tools, and other electronics use energy even when they're not charging. This "idle load" across all U.S. households adds up to the output of 50 large power plants in the country . So don't leave fully charged devices plugged into your home's outlets, unplug rarely used devices or plug them into power strips and timers, and adjust your computers and monitors to automatically power down to the lowest power mode when not in use.

9. Drive a fuel-efficient vehicle.

Gas-smart cars, such as hybrids and fully electric vehicles, save fuel and money . And once all cars and light trucks meet 2025’s clean car standards, which means averaging 54.5 miles per gallon, they’ll be a mainstay. For good reason: Relative to a national fleet of vehicles that averaged only 28.3 miles per gallon in 2011, Americans will spend $80 billion less at the pump each year and cut their automotive emissions by half. Before you buy a new set of wheels, compare fuel-economy performance here .

10. Maintain your ride.

If all Americans kept their tires properly inflated, we could save 1.2 billion gallons of gas each year. A simple tune-up can boost miles per gallon anywhere from 4 percent to 40 percent, and a new air filter can get you a 10 percent boost. Also, remove unnecessary accessories from your car roof. Roof racks and clamshell storage containers can reduce fuel efficiency by as much as 5 percent.

11. Rethink planes, trains, and automobiles.

Choosing to live in walkable smart-growth cities and towns with quality public transportation leads to less driving, less money spent on fuel, and less pollution in the air . Less frequent flying can make a big difference, too. “Air transport is a major source of climate pollution,” Haq says. “If you can take a train instead, do that.” If you must fly, consider purchasing carbon offsets to counterbalance the hefty carbon pollution associated with flying. But not all carbon offset companies are alike. Do your homework to find the best supplier.

12. Reduce, reuse, and recycle.

In the United States, the average person generates 4.5 pounds of trash every day. Fortunately, not all the items we discard end up in landfills; we recycle or compost more than one-third of our trash. In 2014 this saved carbon emissions equivalent to the yearly output of 38 million passenger cars . But we could be doing so much more. “ Reduce should always be the number-one priority,” says NRDC senior resource specialist Darby Hoover . And to reap the environmental benefits of “recyclable” goods, you must recycle according to the rules of your municipality, since systems vary widely by location . Search your municipality’s sanitation department (or equivalent) webpage to learn exactly what you can place in the recycling bin, as counties and cities often differ in what they accept.

This story was originally published on April 20, 2022 and has been updated with new information and links.

This NRDC.org story is available for online republication by news media outlets or nonprofits under these conditions: The writer(s) must be credited with a byline; you must note prominently that the story was originally published by NRDC.org and link to the original; the story cannot be edited (beyond simple things such as grammar); you can’t resell the story in any form or grant republishing rights to other outlets; you can’t republish our material wholesale or automatically—you need to select stories individually; you can’t republish the photos or graphics on our site without specific permission; you should drop us a note to let us know when you’ve used one of our stories.

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What can we do to slow or stop global warming?

There is no one-size-fits-all approach to stopping or slowing global warming, and each individual, business, municipal, state, tribal, and federal entity must weigh their options in light of their own unique set of circumstances.  Experts say  it is likely many strategies working together will be needed. Generally speaking, here are some examples of mitigation strategies we can use to slow or stop the human-caused global warming ( learn more ):

• Where possible, we can switch to renewable sources of energy (such as solar and wind energy) to power our homes and buildings, thus emitting far less heat-trapping gases into the atmosphere.
• Where feasible, we can drive electric vehicles instead of those that burn fossil fuels; or we can use mass transit instead of driving our own cars.
• Where affordable, we can conserve energy by better insulating our homes and buildings, and by replacing old, failing appliances with more energy-efficient models.
• Where practicable, we can counterbalance our annual carbon dioxide emissions by investing in commercial services that draw down an equal amount of carbon out of the atmosphere, such as through planting trees or  carbon capture and storage  techniques.
• Where practical, we can support more local businesses that use and promote sustainable, climate-smart practices such as those listed above.
• We can consider placing an upper limit on the amount of carbon dioxide we will allow ourselves to emit into the atmosphere within a given timeframe.

Note that NOAA doesn’t advocate for or against particular climate policies. Instead, NOAA’s role is to provide data and scientific information about climate, including how it has changed and is likely to change in the future depending on different climate policies or actions society may or may not take. More guidance on courses of action can be found in the National Academy of Sciences' 2010 report, titled  Informing an Effective Response to Climate Change . Also learn more  here,   here,  and  here .

Thanks to low friction between train wheels and tracks, and level train tracks with gradual turns, trains have high energy efficiency. Photo from National Park Service Amtrak Trails and Rails .

Stabilizing global temperature near its current level requires eliminating all emissions of heat-trapping gases or, equivalently, achieving a carbon-neutral society in which people remove as much carbon from the atmosphere as they emit. Achieving this goal will require substantial societal changes in energy technologies and infrastructure that go beyond the collective actions of individuals and households to reduce emissions.

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November 26, 2007

10 Solutions for Climate Change

Ten possibilities for staving off catastrophic climate change

By David Biello

Mark Garlick Getty Images

The enormity of global warming can be daunting and dispiriting. What can one person, or even one nation, do on their own to slow and reverse climate change ? But just as ecologist Stephen Pacala and physicist Robert Socolow, both at Princeton University, came up with 15 so-called " wedges " for nations to utilize toward this goal—each of which is challenging but feasible and, in some combination, could reduce greenhouse gas emissions to safer levels —there are personal lifestyle changes that you can make too that, in some combination, can help reduce your carbon impact. Not all are right for everybody. Some you may already be doing or absolutely abhor. But implementing just a few of them could make a difference.

Forego Fossil Fuels —The first challenge is eliminating the burning of coal , oil and, eventually, natural gas. This is perhaps the most daunting challenge as denizens of richer nations literally eat, wear, work, play and even sleep on the products made from such fossilized sunshine. And citizens of developing nations want and arguably deserve the same comforts, which are largely thanks to the energy stored in such fuels.

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Oil is the lubricant of the global economy, hidden inside such ubiquitous items as plastic and corn, and fundamental to the transportation of both consumers and goods. Coal is the substrate, supplying roughly half of the electricity used in the U.S. and nearly that much worldwide—a percentage that is likely to grow, according to the International Energy Agency. There are no perfect solutions for reducing dependence on fossil fuels (for example, carbon neutral biofuels can drive up the price of food and lead to forest destruction, and while nuclear power does not emit greenhouse gases, it does produce radioactive waste), but every bit counts.

So try to employ alternatives when possible—plant-derived plastics, biodiesel, wind power—and to invest in the change, be it by divesting from oil stocks or investing in companies practicing carbon capture and storage.

Infrastructure Upgrade —Buildings worldwide contribute around one third of all greenhouse gas emissions (43 percent in the U.S. alone), even though investing in thicker insulation and other cost-effective, temperature-regulating steps can save money in the long run. Electric grids are at capacity or overloaded, but power demands continue to rise. And bad roads can lower the fuel economy of even the most efficient vehicle. Investing in new infrastructure, or radically upgrading existing highways and transmission lines, would help cut greenhouse gas emissions and drive economic growth in developing countries.

Of course, it takes a lot of cement, a major source of greenhouse gas emissions, to construct new buildings and roads. The U.S. alone contributed 50.7 million metric tons of carbon dioxide to the atmosphere in 2005 from cement production, which requires heating limestone and other ingredients to 1,450 degrees Celsius (2,642 degrees Fahrenheit). Mining copper and other elements needed for electrical wiring and transmission also causes globe-warming pollution.

But energy-efficient buildings and improved cement-making processes (such as using alternative fuels to fire up the kiln) could reduce greenhouse gas emissions in the developed world and prevent them in the developing world.

Move Closer to Work —Transportation is the second leading source of greenhouse gas emissions in the U.S. (burning a single gallon of gasoline produces 20 pounds of CO 2 ). But it doesn't have to be that way.

One way to dramatically curtail transportation fuel needs is to move closer to work, use mass transit, or switch to walking, cycling or some other mode of transport that does not require anything other than human energy. There is also the option of working from home and telecommuting several days a week.

Cutting down on long-distance travel would also help, most notably airplane flights, which are one of the fastest growing sources of greenhouse gas emissions and a source that arguably releases such emissions in the worst possible spot (higher in the atmosphere). Flights are also one of the few sources of globe-warming pollution for which there isn't already a viable alternative: jets rely on kerosene, because it packs the most energy per pound, allowing them to travel far and fast, yet it takes roughly 10 gallons of oil to make one gallon of JetA fuel. Restricting flying to only critical, long-distance trips—in many parts of the world, trains can replace planes for short- to medium-distance trips—would help curb airplane emissions.

Consume Less —The easiest way to cut back on greenhouse gas emissions is simply to buy less stuff. Whether by forgoing an automobile or employing a reusable grocery sack, cutting back on consumption results in fewer fossil fuels being burned to extract, produce and ship products around the globe.

Think green when making purchases. For instance, if you are in the market for a new car, buy one that will last the longest and have the least impact on the environment. Thus, a used vehicle with a hybrid engine offers superior fuel efficiency over the long haul while saving the environmental impact of new car manufacture.

Paradoxically, when purchasing essentials, such as groceries, buying in bulk can reduce the amount of packaging—plastic wrapping, cardboard boxes and other unnecessary materials. Sometimes buying more means consuming less.

Be Efficient —A potentially simpler and even bigger impact can be made by doing more with less. Citizens of many developed countries are profligate wasters of energy, whether by speeding in a gas-guzzling sport-utility vehicle or leaving the lights on when not in a room.

Good driving—and good car maintenance, such as making sure tires are properly inflated—can limit the amount of greenhouse gas emissions from a vehicle and, perhaps more importantly, lower the frequency of payment at the pump.

Similarly, employing more efficient refrigerators, air conditioners and other appliances, such as those rated highly under the U.S. Environmental Protection Agency's Energy Star program, can cut electric bills while something as simple as weatherproofing the windows of a home can reduce heating and cooling bills. Such efforts can also be usefully employed at work, whether that means installing more efficient turbines at the power plant or turning the lights off when you leave the office .

Eat Smart, Go Vegetarian? —Corn grown in the U.S. requires barrels of oil for the fertilizer to grow it and the diesel fuel to harvest and transport it. Some grocery stores stock organic produce that do not require such fertilizers, but it is often shipped from halfway across the globe. And meat, whether beef, chicken or pork, requires pounds of feed to produce a pound of protein.

Choosing food items that balance nutrition, taste and ecological impact is no easy task. Foodstuffs often bear some nutritional information, but there is little to reveal how far a head of lettuce, for example, has traveled.

University of Chicago researchers estimate that each meat-eating American produces 1.5 tons more greenhouse gases through their food choice than do their vegetarian peers. It would also take far less land to grow the crops necessary to feed humans than livestock, allowing more room for planting trees.

Stop Cutting Down Trees —Every year, 33 million acres of forests are cut down . Timber harvesting in the tropics alone contributes 1.5 billion metric tons of carbon to the atmosphere. That represents 20 percent of human-made greenhouse gas emissions and a source that could be avoided relatively easily.

Improved agricultural practices along with paper recycling and forest management—balancing the amount of wood taken out with the amount of new trees growing—could quickly eliminate this significant chunk of emissions.

And when purchasing wood products, such as furniture or flooring, buy used goods or, failing that, wood certified to have been sustainably harvested. The Amazon and other forests are not just the lungs of the earth, they may also be humanity's best short-term hope for limiting climate change.

Unplug —Believe it or not, U.S. citizens spend more money on electricity to power devices when off than when on. Televisions, stereo equipment, computers, battery chargers and a host of other gadgets and appliances consume more energy when seemingly switched off, so unplug them instead.

Purchasing energy-efficient gadgets can also save both energy and money—and thus prevent more greenhouse gas emissions. To take but one example, efficient battery chargers could save more than one billion kilowatt-hours of electricity—$100 million at today's electricity prices—and thus prevent the release of more than one million metric tons of greenhouse gases.

Swapping old incandescent lightbulbs for more efficient replacements, such as compact fluorescents (warning: these lightbulbs contain mercury and must be properly disposed of at the end of their long life), would save billions of kilowatt-hours. In fact, according to the EPA, replacing just one incandescent lightbulb in every American home would save enough energy to provide electricity to three million American homes.

One Child —There are at least 6.6 billion people living today, a number that is predicted by the United Nations to grow to at least nine billion by mid-century. The U.N. Environmental Program estimates that it requires 54 acres to sustain an average human being today—food, clothing and other resources extracted from the planet. Continuing such population growth seems unsustainable.

Falling birth rates in some developed and developing countries (a significant portion of which are due to government-imposed limits on the number of children a couple can have) have begun to reduce or reverse the population explosion. It remains unclear how many people the planet can comfortably sustain, but it is clear that per capita energy consumption must go down if climate change is to be controlled.

Ultimately, a one child per couple rule is not sustainable either and there is no perfect number for human population. But it is clear that more humans means more greenhouse gas emissions.

Future Fuels —Replacing fossil fuels may prove the great challenge of the 21st century. Many contenders exist, ranging from ethanol derived from crops to hydrogen electrolyzed out of water, but all of them have some drawbacks, too, and none are immediately available at the scale needed.

Biofuels can have a host of negative impacts, from driving up food prices to sucking up more energy than they produce. Hydrogen must be created, requiring either reforming natural gas or electricity to crack water molecules. Biodiesel hybrid electric vehicles (that can plug into the grid overnight) may offer the best transportation solution in the short term, given the energy density of diesel and the carbon neutral ramifications of fuel from plants as well as the emissions of electric engines. A recent study found that the present amount of electricity generation in the U.S. could provide enough energy for the country's entire fleet of automobiles to switch to plug-in hybrids , reducing greenhouse gas emissions in the process.

But plug-in hybrids would still rely on electricity, now predominantly generated by burning dirty coal. Massive investment in low-emission energy generation, whether solar-thermal power or nuclear fission , would be required to radically reduce greenhouse gas emissions. And even more speculative energy sources—hyperefficient photovoltaic cells, solar energy stations in orbit or even fusion—may ultimately be required.

The solutions above offer the outline of a plan to personally avoid contributing to global warming. But should such individual and national efforts fail, there is another, potentially desperate solution:

Experiment Earth —Climate change represents humanity's first planetwide experiment. But, if all else fails, it may not be the last. So-called geoengineering , radical interventions to either block sunlight or reduce greenhouse gases, is a potential last resort for addressing the challenge of climate change.

Among the ideas: releasing sulfate particles in the air to mimic the cooling effects of a massive volcanic eruption; placing millions of small mirrors or lenses in space to deflect sunlight; covering portions of the planet with reflective films to bounce sunlight back into space; fertilizing the oceans with iron or other nutrients to enable plankton to absorb more carbon; and increasing cloud cover or the reflectivity of clouds that already form.

All may have unintended consequences, making the solution worse than the original problem. But it is clear that at least some form of geoengineering will likely be required: capturing carbon dioxide before it is released and storing it in some fashion, either deep beneath the earth, at the bottom of the ocean or in carbonate minerals. Such carbon capture and storage is critical to any serious effort to combat climate change.

Additional reporting by Larry Greenemeier and Nikhil Swaminathan .

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It is not too late to take action on climate change.

The Science

Given what we know about the threats that climate change poses to humans, we must take swift action. As a global community, we need to soon level off—and then decrease—the amount of carbon dioxide (CO 2 ) and other greenhouse gases in the atmosphere. The faster we do this, the less damage we will cause to our world and our way of life.

Stopping the Rise in CO2

The fastest way to address the buildup of CO 2 in the atmosphere is to stop adding more. Many vital parts of our economy emit huge amounts of greenhouse gases: the way we generate electricity and heat for our buildings and industry; the oil we burn to power our cars, trucks and planes; the refrigerants we use to preserve our food and cool our buildings; and the intensive manufacturing processes for making concrete and steel .

And yet there are many ways to reduce the CO 2 from these sectors. We can replace high-emitting fuels like coal, oil and gas with nearly “carbon-free” alternatives, such as solar power , wind power , or nuclear power . We can capture the CO 2 from fossil fuel power and manufacturing plants and store it underground. We can also update our buildings and infrastructure, so that it takes less energy to build and use them.

We can add to these efforts by trying to remove some of the CO 2 that is already in the atmosphere: for instance, by reforesting the Earth, by changing our farming practices to store more carbon in the soil , or through “direct air capture” technology. However, these methods will likely not be able to remove CO 2 quicker than we are now adding it to the atmosphere. We must begin with stopping our runaway greenhouse gas emissions.

Adapting to Change

Because human activity has already added such a large amount of greenhouse gases to the atmosphere, the world is now experiencing the early effects of climate change. We need to prepare for and adapt to these changes, so that we can protect human health, water and food supplies, our cities and towns , and natural habitats. A new field of work has emerged to reinforce coastlines to shield them from rising oceans , grow new crops to match regions’ changing climates, protect our infrastructure from wildfires and hurricanes , and plan for shifting supplies of water and food.

Today, these tasks are still manageable. If we get ahead of the regional changes we know are coming, and if we put the needs of the poorest and most vulnerable first, very few parts of the world will be irreparably damaged by the climate change we have already caused.

But unless we also actively cut our greenhouse gas emissions, unchecked climate change could eventually put safe and just adaptation beyond our reach. This possibility has led some scientists to study more extreme and controversial options, like geoengineering; for example, there are proposals that would try to artificially cool the Earth to counter some of the effects of climate change. Urgent action is needed to avoid the need for these riskier options.

Driving Solutions

Great progress can and must be achieved with the low-carbon technologies we have today. And all of us can help speed the pace at which these technologies take root and spread. Individuals can change their behavior and advocate for ambitious new policies. Corporations can drive change across whole industries. Governments can enact laws to make it easier and cheaper to cut greenhouse gas emissions, and to help communities prepare for new challenges. And intergovernmental agreements such as the Paris Agreement have already created a strong framework for international cooperation and aggressive action, if governments around the world step up their commitments .

At the same time, the world does not have a true alternative to fossil fuels that can meet all our current energy needs, let alone meet an increased demand in the future. We severely lack the suite of solutions to address climate change at an economic and social cost that we can agree to bear.

A tremendous amount of work is taking place at MIT and other scientific and engineering institutions around the world to develop these options, in collaboration with the industries and communities that can deploy and scale them. But to quicken the pace of technological breakthroughs, policymakers need to set the stage now for game-changing advances in multiple fields of science, technology, and policy. To take on the hardest challenges in reducing our emissions, in removing CO 2 from the atmosphere, and in adapting to a changing climate, we urgently need new tools.

Seizing the Opportunity

The MIT community fundamentally agrees that climate change presents grave risks that demand society’s urgent attention. The challenge requires an aggressive and pragmatic plan to achieve a net zero carbon global energy system, the sooner the better, for all of humankind.

If academia, business, government, and citizens act together toward this common goal, we can create a pollution-free energy system; form a prosperous, adaptable and resilient society; keep human, animal, and plant life flourishing; and create a better world for ourselves and generations to come.

You may notice that we, the writers on this site, use the word “we” to collectively refer to those who have benefitted in various ways from burning fossil fuels, those who will face the impacts of climate change, and those whose responsibility it is to act. We did this intentionally to create a sense of community in addressing this challenge. However, we acknowledge that people and groups across the globe have not equally benefitted from the use of fossil fuels, and many – including young people and future generations – will disproportionately endure the consequences. We, those who are affiliated with MIT and those who live in developed countries, are often among those whose activities have historically had a disproportionate impact on climate change. Therefore, we see that we have a greater responsibility – as professionals, citizens, community members, and consumers – to act to reverse its course.

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Here are the most effective things you can do to fight climate change

PhD Student, University of Leeds

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Max Callaghan does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

University of Leeds provides funding as a founding partner of The Conversation UK.

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Limiting global warming to 1.5°C above pre-industrial levels requires reaching net zero emissions by the middle of this century. This means that, in less than three decades, we need to reverse more than a century of rising emissions and bring annual emissions down to near zero, while balancing out all remaining unavoidable emissions by actively removing carbon from the atmosphere.

To help speed this process as individuals, we’ve got to do everything we can to cut down our use of fossil fuels. But many people aren’t aware of the most effective ways to do this. Thankfully, the latest report by the UN climate change panel IPCC devotes a chapter to all the ways in which changes in people’s behaviour can accelerate the transition to net zero.

The chapter includes an analysis of 60 individual actions which can help fight climate change, building on research led by Diana Ivanova at the University of Leeds – and to which I contributed. We grouped these actions into three areas: avoiding consumption, shifting consumption and improving consumption (making it more efficient). The charts below, produced for the IPCC report , show what we found.

What to avoid

By far the most effective things to avoid involve transport. Living without a car reduces greenhouse gas emissions by an average of 2 tonnes of CO₂ emissions per person per year, while avoiding a single long distance return flight cuts emissions by an average of 1.9 tonnes. That’s equivalent to driving a typical EU car more than 16,000km from Hamburg, Germany to Ulaanbaatar, Mongolia and back.

Since the vast majority of the world’s population do not fly at all – and of those who do, only a small percentage fly frequently – fliers can make very substantial reductions to their carbon footprints with each flight they avoid.

What to shift

But living sustainably is not just about giving things up. Large reductions in emissions can be achieved by shifting to a different way of doing things. Because driving is so polluting, for example, shifting to public transport , walking or cycling can make an enormous change, with added benefits for your personal health and local air pollution levels.

Likewise, because of the high emissions associated with meat and dairy – particularly those produced by farming sheep and cows – shifting towards more sustainable diets can substantially reduce your carbon footprint. A totally vegan diet is the most effective way to do this, but sizeable savings can be made simply by switching from beef and lamb to pork and chicken.

What to improve

Finally, the things we do already could be made more efficient by improving carbon efficiency at home: for example by using insulation and heat pumps , or producing your own renewable energy by installing solar panels . Switching from a combustion car to an electric one – ideally a battery EV, which generates much larger reductions in emissions than hybrid or fuel cell EVs – will make your car journeys more efficient. Plus, its effect on emissions will increase as time goes by and the amount of electricity generated by renewables grows.

In the race to net zero, every tonne of CO₂ really does count. If more of us take even a few of these suggestions into account, we’re collectively more likely to be able to achieve the ambitious goals set out in the Paris climate agreement . Of course, these changes will need to be backed by major political action on sustainability at the same time.

If we’re to use less fossil fuel energy, the use of fossil fuels needs to be either restricted or made more expensive. The social consequences of this need to be carefully managed so that carbon pricing schemes can benefit people on lower incomes: which can happen if revenues are redistributed to take the financial burden off poorer households.

But there’s a whole lot more that governments could do to help people to live more sustainably, such as providing better, safer public transport and “ active travel ” infrastructure (such as bike lanes and pedestrian zones) so that people have alternatives to driving and flying.

There’s no avoiding the fact that if political solutions are to address climate change with the urgency our global situation requires, these solutions will limit the extent to which we can indulge in carbon-intensive behaviours. More than anything, we must vote into power those prepared to make such tough decisions for the sake of our planet’s future.

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Buildings with green roofs, like this one in Stuttgart, Germany, don't use as much energy as standard buildings and emit fewer greenhouse gasses.

100 Practical Ways to Reverse Climate Change

You know some of them—use renewable energy, eat less meat—but others will surprise you.

At a time when the science of global warming is under attack and many people complain of climate change fatigue, some cheering news occurred last month: A book about climate change became a New York Times bestseller in its first week of publication.

Drawdown: The Most Comprehensive Plan Ever Proposed to Reverse Global Warming , edited by environmentalist Paul Hawken , is the first environmental book to make such a splashy debut since Elizabeth Kolbert’s Field Notes from a Catastrophe in 2006.

Kolbert’s book warned of cataclysm; Hawken’s tries to prevent it. Bringing together geologists, engineers, agronomists, climatologists, biologists, botanists, economists, financial analysts, architects, NGOs, activists, and other experts, Drawdown offers 100 solutions to reverse global warming.

When National Geographic caught up with Hawken at his home in San Francisco, he explained why climate change is a gift, not a curse; why empowering girls and women is the number one solution; and what role musk ox, reindeer, and wolves have to play.

Let’s start with a definition. What is “ Drawdown ”? And how is it different from other methods of tackling global warming?

The idea for Project Drawdown goes back to 2001. There has never been an attempt to map, measure, and model the 100 most substantive solutions to global warming. There has been a tendency to silver bullet the problem, which is to look for the big solution: the Archimedean lever. If you just find it and pull it, somehow we're going to get rid of this problem and stabilize emissions.

That's simply not true. All of us have heard again and again that if we go to solar, wind, and renewable energy—and maybe electric vehicles and storage—prevent deforestation, and reduce meat consumption, we will get a hall pass to the 22nd century.

Those solutions are crucial to achieving drawdown as well, so I'm not in any way diminishing their importance. I'm just saying a great number of salient, important solutions are often left out. That’s why we include 100 different strategies.

Michael Pollan , the writer and activist, once said that the biggest question facing us with regard to climate change is: Why bother? Have you got an answer for us?

I see it as a gift not a curse. Why bother means game over. I actually see it as game on. It's a different point of view. Climate change is feedback, and any system that doesn't incorporate that feedback is stupid and fails and dies. Here, we have feedback, and the feedback it's giving us is a pathway to a much better world than the one we live in now.

This is not a path to retrogression or a future that we won't like. It's actually to a much better future: cleaner, healthier, with more jobs, more security, and more life on the planet. What climate change is offering us is actually a new way of seeing ourselves, our relationship to each other, and all living beings on this planet, which can be extraordinary in terms of imagination, innovation, creativity, and real breakthroughs in human thinking.

President Trump recently introduced a global gag rule on family planning. Explain how this will also have a powerful, negative effect on climate change.

What he's done is simply project ignorance to satisfy his right-wing supporters. I think it will have some effect, but not much. The idea that the United States is all-powerful is an American illusion.

As regards family planning, the United N ations has a three population projections for 2050—high, median, and low. The highest is 10.8 billion, the median is 9.7 billion. The difference between the high and the median population projections comes from family planning. There are two pathways. One is to provide education for girls in those countries where they are taken out of school in fifth and sixth grade, and married off, because of cultural, religious, or other forces. Those girls tend to have five children or more. But if a girl is allowed to continue education and pass tenth or eleventh grade, her reproduction rate falls to two—which is why the empowerment of girls and women is the number one solution to global warming.

Bike racks, like this one in Copenhagen, can get crowded in Denmark, where 18 percent of local trips are done by bicycle.

Nuclear energy is a controversial choice as a solution to climate change. But China is showing a new way forward—ironically, with a technology developed, then shelved, by the U.S.

Molten salt reactors were first developed at Oak Ridge National Laboratory , in the 1950s. I don't know why we dropped it but I do know the Chinese have picked it up. [Laughs] The nuclear power industry in Europe and the U.S. has pretty much come to a stop. The plants under construction are way over budget, nobody wants to finance them, nobody will insure them except the governments themselves.

But in China and Asia , that's not the case. The Chinese are building them at a very rapid pace at a much lower cost. Many people objected to us including it, and I don't think safety in the long term, in terms of plutonium storage, has been solved. But certainly some of the new reactors are much different in terms of their impact.

Architecture is increasingly playing a role in combatting global warming. Tell us about “ cool roofs .”

Cool roofs are roofs that either reflect the heat back, in the sense of white roofs, or green roofs that have foliage and perennial plants. Each provides a different mechanism to cool the building underneath. White roofs are particularly suitable for tropical areas or areas where there’s high radiation.

When you fly into Los Angeles, you'll see more and more white roofs. It's actually a very simple technique. Green roofs can be installed anywhere, whether in tropical or temperate climates. They have a marvelous insulation factor. They are big in Germany and Canada, as well as the U.S. and the U.K.

Self-driving cars, like these lined up at Uber Advanced Technologies Center in Pittsburgh, Pennsylvania, could encourage people to give up automobile ownership.

In Denmark, 18 percent of local trips are done by bicycle. In the Netherlands, it is 27 percent. But in the U.S ., the figure is just 1 percent. How can Americans be persuaded to swap four wheels for two? And what effect would that have on global warming ?

The United States is a car-loving culture and has designed its cities and roadways in such a way that it's dangerous for bicycles to be on the roads. As a result, it is one of the most dangerous places for bicycles.

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But if you create infrastructure for bikes , people will use them, even in the north. Look at Denmark. The phrase “build it and they will come” is true for bicycles. If people see a safe lane for a bicycle, the invitation is there and they will begin to explore doing it themselves.

This can have a huge impact on health and well-being, but also the number of gigatons of carbon we need to reduce by 2050. The overall cost is negative compared to building more roads or more mass transit. It's a win-win strategy cities can take, both in terms of municipal budgets, health, and the reduction of pollution and traffic.

We all love to travel but, worldwide, flights produced 781 million metric tons of CO 2 in 2015. How can this gargantuan figure be lowered?

Aviation is the source of 2 to 3 percent of global CO 2 emissions , and all the big aircraft companies are working on solutions. But they have to think 30 years out; it takes a long time to design a plane and ensure its safety. That is due to extraordinarily careful engineering.

There are a whole series of new technologies being applied in the lab and in test aircraft, from the shape of fuselages to placing jet engines at the rear of aircraft, in order to save on weight. The Germans are developing something called “late descent.” The way aircraft are marshalled in and out of airports, or taxi on the runways, is a significant cause of CO 2 emissions. What you see now are operational shifts in take-off and landing that can reduce fuel use from 10 to 30 percent.

Aviation companies are also talking about designing planes that will actually be electric or run on biofuels. It's a very different mode of transport. It’s very quiet and will save 40 to 50 percent of the energy that’s presently being used by aircraft. It's an area of great innovation, except I would be patient because it does take a long time.

China is building relatively cheap, small nuclear reactors, like this one in Changjiang. But longterm safety remains a concern.

Towards the end of the book, you describe some futuristic ideas that may soon become reality. Tell us about the idea of repopulating the mammoth steppe.

Repopulating the mammoth steppe is in some ways my favorite. The mammoth steppe is a subarctic region that used to stretch from Alaska to Canada, all the way across Europe and into Russia. Now, it's just Russia. It was the world's largest grassland. But 12,000 years ago, human beings swept in and wiped out all the animals.

Now, two biologists , Sergey Zimof and Alexander Sergeev, want to create the Pleistocene Park to repopulate the mammoth steppe with animals that were originally there, except for the woolly mammoth, which is extinct. Elk, wolves, reindeer, or musk oxen eat the dead grass underneath the snow by pushing the snow away with their horns, snouts, or hooves. In so doing, they reduce the temperature of the soil in the subarctic by two degrees Celsius, which then enhances the ability of that area to retain its permafrost.

Nothing is more futuristic than a car that drives itself, which is why Apple and Tesla, as well as traditional manufacturers like Ford, are all racing to develop one. Trouble is, they keep crashing. Is there a future for autonomous vehicles —and what effect would they have on climate change ?

The whole issue of mobility is up for grabs. Do we really need a 4,000-pound car to deliver a 120-pound woman to the supermarket? I don't think so. What we're looking at is a very different relationship between human beings’ mobility and autonomy, in terms of vehicles. Opinion is divided. But if it's done properly, it means a 40 or even 60 percent reduction in the total number of cars on the road, or in garages, because that's where they are most of the time. A car is only used 4 percent of the time. The other 96 percent it is idle.

If we have mobility at our fingertips—which is to say, I need a vehicle, I need a pod, something to take me from here to there, and it arrives quickly and is safe—then we can say, I don't need a car, especially in urban environments. It can not only reduce the amount of vehicles being produced in the world. These vehicles can also be electric, charged by renewable energy, like wind.

It would also have a big impact on roads because these cars are smaller and don't need the same kind of infrastructure. They're talking about making roads that are narrower, returning cities more to pedestrian-scapes instead of road-scapes, expanding sidewalks and cafe areas. It also has a tremendous impact on sound, because these vehicles are very quiet.

Some of them have crashed, but we also have to remember the amount of vehicular deaths and carnage caused every year by existing vehicles. Given the rate of innovation in the technology, I have no doubt that it will be achieved successfully.

This interview was edited for length and clarity.

Simon Worrall curates Book Talk . Follow him on Twitter or at simonworrallauthor.com .

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A problem built into our relationship with energy itself. Photo by Ferdinando Scianna/Magnum

Deep warming

Even if we ‘solve’ global warming, we face an older, slower problem. waste heat could radically alter earth’s future.

by Mark Buchanan   + BIO

The world will be transformed. By 2050, we will be driving electric cars and flying in aircraft running on synthetic fuels produced through solar and wind energy. New energy-efficient technologies, most likely harnessing artificial intelligence, will dominate nearly all human activities from farming to heavy industry. The fossil fuel industry will be in the final stages of a terminal decline. Nuclear fusion and other new energy sources may have become widespread. Perhaps our planet will even be orbited by massive solar arrays capturing cosmic energy from sunlight and generating seemingly endless energy for all our needs.

That is one possible future for humanity. It’s an optimistic view of how radical changes to energy production might help us slow or avoid the worst outcomes of global warming. In a report from 1965, scientists from the US government warned that our ongoing use of fossil fuels would cause global warming with potentially disastrous consequences for Earth’s climate. The report, one of the first government-produced documents to predict a major crisis caused by humanity’s large-scale activities, noted that the likely consequences would include higher global temperatures, the melting of the ice caps and rising sea levels. ‘Through his worldwide industrial civilisation,’ the report concluded, ‘Man is unwittingly conducting a vast geophysical experiment’ – an experiment with a highly uncertain outcome, but clear and important risks for life on Earth.

Since then, we’ve dithered and doubted and argued about what to do, but still have not managed to take serious action to reduce greenhouse gas emissions, which continue to rise. Governments around the planet have promised to phase out emissions in the coming decades and transition to ‘green energy’. But global temperatures may be rising faster than we expected: some climate scientists worry that rapid rises could create new problems and positive feedback loops that may accelerate climate destabilisation and make parts of the world uninhabitable long before a hoped-for transition is possible.

Despite this bleak vision of the future, there are reasons for optimists to hope due to progress on cleaner sources of renewable energy, especially solar power. Around 2010, solar energy generation accounted for less than 1 per cent of the electricity generated by humanity. But experts believe that, by 2027, due to falling costs, better technology and exponential growth in new installations, solar power will become the largest global energy source for producing electricity. If progress on renewables continues, we might find a way to resolve the warming problem linked to greenhouse gas emissions. By 2050, large-scale societal and ecological changes might have helped us avoid the worst consequences of our extensive use of fossil fuels.

It’s a momentous challenge. And it won’t be easy. But this story of transformation only hints at the true depth of the future problems humanity will confront in managing our energy use and its influence over our climate.

As scientists are gradually learning, even if we solve the immediate warming problem linked to the greenhouse effect, there’s another warming problem steadily growing beneath it. Let’s call it the ‘deep warming’ problem. This deeper problem also raises Earth’s surface temperature but, unlike global warming, it has nothing to do with greenhouse gases and our use of fossil fuels. It stems directly from our use of energy in all forms and our tendency to use more energy over time – a problem created by the inevitable waste heat that is generated whenever we use energy to do something. Yes, the world may well be transformed by 2050. Carbon dioxide levels may stabilise or fall thanks to advanced AI-assisted technologies that run on energy harvested from the sun and wind. And the fossil fuel industry may be taking its last breaths. But we will still face a deeper problem. That’s because ‘deep warming’ is not created by the release of greenhouse gases into the atmosphere. It’s a problem built into our relationship with energy itself.

F inding new ways to harness more energy has been a constant theme of human development. The evolution of humanity – from early modes of hunter-gathering to farming and industry – has involved large systematic increases in our per-capita energy use. The British historian and archaeologist Ian Morris estimates, in his book Foragers, Farmers, and Fossil Fuels: How Human Values Evolve (2015), that early human hunter-gatherers, living more than 10,000 years ago, ‘captured’ around 5,000 kcal per person per day by consuming food, burning fuel, making clothing, building shelter, or through other activities. Later, after we turned to farming and enlisted the energies of domesticated animals, we were able to harness as much as 30,000 kcal per day. In the late 17th century , the exploitation of coal and steam power marked another leap: by 1970, the use of fossil fuels allowed humans to consume some 230,000 kcal per person per day. (When we think about humanity writ large as ‘humans’, it’s important to acknowledge that the average person in the wealthiest nations consumes up to 100 times more energy than the average person in the poorest nations.) As the global population has risen and people have invented new energy-dependent technologies, our global energy use has continued to climb.

In many respects, this is great. We can now do more with less effort and achieve things that were unimaginable to the 17th-century inventors of steam engines, let alone to our hominin ancestors. We’ve made powerful mining machines, superfast trains, lasers for use in telecommunications and brain-imaging equipment. But these creations, while helping us, are also subtly heating the planet.

All the energy we humans use – to heat our homes, run our factories, propel our automobiles and aircraft, or to run our electronics – eventually ends up as heat in the environment. In the shorter term, most of the energy we use flows directly into the environment. It gets there through hot exhaust gases, friction between tires and roads, the noises generated by powerful engines, which spread out, dissipate, and eventually end up as heat. However, a small portion of the energy we use gets stored in physical changes, such as in new steel, plastic or concrete. It’s stored in our cities and technologies. In the longer term, as these materials break down, the energy stored inside also finds its way into the environment as heat. This is a direct consequence of the well-tested principles of thermodynamics.

Waste heat will pose a problem that is every bit as serious as global warming from greenhouse gases

In the early decades of the 21st century , this heat created by simply using energy, known as ‘waste heat’, is not so serious. It’s equivalent to roughly 2 per cent of the planetary heating imbalance caused by greenhouse gases – for now. But, with the passing of time, the problem is likely to get much more serious. That’s because humans have a historical tendency to consistently discover and produce things, creating entirely new technologies and industries in the process: domesticated animals for farming; railways and automobiles; global air travel and shipping; personal computers, the internet and mobile phones. The result of such activities is that we end up using more and more energy, despite improved energy efficiency in nearly every area of technology.

During the past two centuries at least (and likely for much longer), our yearly energy use has doubled roughly every 30 to 50 years . Our energy use seems to be growing exponentially, a trend that shows every sign of continuing. We keep finding new things to do and almost everything we invent requires more and more energy: consider the enormous energy demands of cryptocurrency mining or the accelerating energy requirements of AI.

If this historical trend continues, scientists estimate waste heat will pose a problem in roughly 150-200 years that is every bit as serious as the current problem of global warming from greenhouse gases. However, deep heating will be more pernicious as we won’t be able to avoid it by merely shifting from one kind energy to another. A profound problem will loom before us: can we set strict limits on all the energy we use? Can we reign in the seemingly inexorable expansion of our activities to avoid destroying our own environment?

Deep warming is a problem hiding beneath global warming, but one that will become prominent if and when we manage to solve the more pressing issue of greenhouse gases. It remains just out of sight, which might explain why scientists only became concerned about the ‘waste heat’ problem around 15 years ago.

O ne of the first people to describe the problem is the Harvard astrophysicist Eric Chaisson, who discussed the issue of waste heat in a paper titled ‘Long-Term Global Heating from Energy Usage’ (2008). He concluded that our technological society may be facing a fundamental limit to growth due to ‘unavoidable global heating … dictated solely by the second law of thermodynamics, a biogeophysical effect often ignored when estimating future planetary warming scenarios’. When I emailed Chaisson to learn more, he told me the history of his thinking on the problem:

It was on a night flight, Paris-Boston [circa] 2006, after a UNESCO meeting on the environment when it dawned on me that the IPCC were overlooking something. While others on the plane slept, I crunched some numbers literally on the back of an envelope … and then hoped I was wrong, that is, hoped that I was incorrect in thinking that the very act of using energy heats the air, however slightly now.

The transformation of energy into heat is among the most ubiquitous processes of physics

Chaisson drafted the idea up as a paper and sent it to an academic journal. Two anonymous reviewers were eager for it to be published. ‘A third tried his damnedest to kill it,’ Chaisson said, the reviewer claiming the findings were ‘irrelevant and distracting’. After it was finally published, the paper got some traction when it was covered by a journalist and ran as a feature story on the front page of The Boston Globe . The numbers Chaisson crunched, predictions of our mounting waste heat, were even run on a supercomputer at the US National Center for Atmospheric Research, by Mark Flanner, a professor of earth system science. Flanner, Chaisson suspected at the time, was likely ‘out to prove it wrong’. But, ‘after his machine crunched for many hours’, he saw the same results that Chaisson had written on the back of an envelope that night in the plane.

Around the same time, also in 2008, two engineers, Nick Cowern and Chihak Ahn, wrote a research paper entirely independent of Chaisson’s work, but with similar conclusions. This was how I first came across the problem. Cowern and Ahn’s study estimated the total amount of waste heat we’re currently releasing to the environment, and found that it is, right now, quite small. But, like Chaisson, they acknowledged that the problem would eventually become serious unless steps were taken to avoid it.

That’s some of the early history of thinking in this area. But these two papers, and a few other analyses since, point to the same unsettling conclusion: what I am calling ‘deep warming’ will be a big problem for humanity at some point in the not-too-distant future. The precise date is far from certain. It might be 150 years , or 400, or 800, but it’s in the relatively near future, not the distant future of, say, thousands or millions of years. This is our future.

T he transformation of energy into heat is among the most ubiquitous processes of physics. As cars drive down roads, trains roar along railways, planes cross the skies and industrial plants turn raw materials into refined products, energy gets turned into heat, which is the scientific word for energy stored in the disorganised motions of molecules at the microscopic level. As a plane flies from Paris to Boston, it burns fuel and thrusts hot gases into the air, generates lots of sound and stirs up contrails. These swirls of air give rise to swirls on smaller scales which in turn make smaller ones until the energy ultimately ends up lost in heat – the air is a little warmer than before, the molecules making it up moving about a little more vigorously. A similar process takes place when energy is used by the tiny electrical currents inside the microchips of computers, silently carrying out computations. Energy used always ends up as heat. Decades ago, research by the IBM physicist Rolf Landauer showed that a computation involving even a single computing bit will release a certain minimum amount of heat to the environment.

How this happens is described by the laws of thermodynamics, which were described in the mid-19th century by scientists including Sadi Carnot in France and Rudolf Clausius in Germany. Two key ‘laws’ summarise its main principles.

The first law of thermodynamics simply states that the total quantity of energy never changes but is conserved. Energy, in other words, never disappears, but only changes form. The energy initially stored in an aircraft’s fuel, for example, can be changed into the energetic motion of the plane. Turn on an electric heater, and energy initially held in electric currents gets turned into heat, which spreads into the air, walls and fabric of your house. The total energy remains the same, but it markedly changes form.

We’re generating waste heat all the time with everything we do

The second law of thermodynamics, equally important, is more subtle and states that, in natural processes, the transformation of energy always moves from more organised and useful forms to less organised and less useful forms. For an aircraft, the energy initially concentrated in jet fuel ends up dissipated in stirred-up winds, sounds and heat spread over vast areas of the atmosphere in a largely invisible way. It’s the same with the electric heater: the organised useful energy in the electric currents gets dissipated and spread into the low-grade warmth of the walls, then leaks into the outside air. Although the amount of energy remains the same, it gradually turns into less organised, less usable forms. The end point of the energy process produces waste heat. And we’re generating it all the time with everything we do.

Data on world energy consumption shows that, collectively, all humans on Earth are currently using about 170,000 terawatt-hours (TWh), which is a lot of energy in absolute terms – a terawatt-hour is the total energy consumed in one hour by any process using energy at a rate of 1 trillion watts. This huge number isn’t surprising, as it represents all the energy being used every day by the billions of cars and homes around the world, as well as by industry, farming, construction, air traffic and so on. But, in the early 21st century , the warming from this energy is still much less than the planetary heating due to greenhouse gases.

Concentrations of greenhouse gases such as CO 2 and methane are quite small, and only make a fractional difference to how much of the Sun’s energy gets trapped in the atmosphere, rather than making it back out to space. Even so, this fractional difference has a huge effect because the stream of energy arriving from the Sun to Earth is so large. Current estimates of this greenhouse energy imbalance come to around 0.87 W per square meter, which translates into a total energy figure about 50 times larger than our waste heat. That’s reassuring. But as Cowern and Ahn wrote in their 2008 paper, things aren’t likely to stay this way over time because our energy usage keeps rising. Unless, that is, we can find some radical way to break the trend of using ever more energy.

O ne common objection to the idea of the deep warming is to claim that the problem won’t really arise. ‘Don’t worry,’ someone might say, ‘with efficient technology, we’re going to find ways to stop using more energy; though we’ll end up doing more things in the future, we’ll use less energy.’ This may sound plausible at first, because we are indeed getting more efficient at using energy in most areas of technology. Our cars, appliances and laptops are all doing more with less energy. If efficiency keeps improving, perhaps we can learn to run these things with almost no energy at all? Not likely, because there are limits to energy efficiency.

Over the past few decades, the efficiency of heating in homes – including oil and gas furnaces, and boilers used to heat water – has increased from less than 50 per cent to well above 90 per cent of what is theoretically possible. That’s good news, but there’s not much more efficiency to be realised in basic heating. The efficiency of lighting has also vastly improved, with modern LED lighting turning something like 70 per cent of the applied electrical energy into light. We will gain some efficiencies as older lighting gets completely replaced by LEDs, but there’s not a lot of room left for future efficiency improvements. Similar efficiency limits arise in the growing or cooking of food; in the manufacturing of cars, bikes and electronic devices; in transportation, as we’re taken from place to place; in the running of search engines, translation software, GPT-4 or other large-language models.

Even if we made significant improvements in the efficiencies of these technologies, we will only have bought a little time. These changes won’t delay by much the date when deep warming becomes a problem we must reckon with.

Optimising efficiencies is just a temporary reprieve, not a radical change in our human future

As a thought experiment, suppose we could immediately improve the energy efficiency of everything we do by a factor of 10 – a fantastically optimistic proposal. That is, imagine the energy output of humans on Earth has been reduced 10 times , from 170,000 TWh to 17,000 TWh . If our energy use keeps expanding, doubling every 30-50 years or so (as it has for centuries), then a 10-fold increase in waste heat will happen in just over three doubling times, which is about 130 years : 17,000 TWh doubles to 34,000 TWh , which doubles to 68,000 TWh , which doubles to 136,000 TWh , and so on. All those improvements in energy efficiency would quickly evaporate. The date when deep warming hits would recede by 130 years or so, but not much more. Optimising efficiencies is just a temporary reprieve, not a radical change in our human future.

Improvements in energy efficiency can also have an inverse effect on our overall energy use. It’s easy to think that if we make a technology more efficient, we’ll then use less energy through the technology. But economists are deeply aware of a paradoxical effect known as ‘rebound’, whereby improved energy efficiency, by making the use of a technology cheaper, actually leads to more widespread use of that technology – and more energy use too. The classic example, as noted by the British economist William Stanley Jevons in his book The Coal Question (1865), is the invention of the steam engine. This new technology could extract energy from burning coal more efficiently, but it also made possible so many new applications that the use of coal increased. A recent study by economists suggests that, across the economy, such rebound effects might easily swallow at least 50 per cent of any efficiency gains in energy use. Something similar has already happened with LED lights, for which people have found thousands of new uses.

If gains in efficiency won’t buy us lots of time, how about other factors, such as a reduction of the global population? Scientists generally believe that the current human population of more than 8 billion people is well beyond the limits of our finite planet, especially if a large fraction of this population aspires to the resource-intensive lifestyles of wealthy nations. Some estimates suggest that a more sustainable population might be more like 2 billion , which could reduce energy use significantly, potentially by a factor of three or four. However, this isn’t a real solution: again, as with the example of improved energy efficiency, a one-time reduction of our energy consumption by a factor of three will quickly be swallowed up by an inexorable rise in energy use. If Earth’s population were suddenly reduced to 2 billion – about a quarter of the current population – our energy gains would initially be enormous. But those gains would be erased in two doubling times, or roughly 60-100 years , as our energy demands would grow fourfold.

S o, why aren’t more people talking about this? The deep warming problem is starting to get more attention. It was recently mentioned on Twitter by the German climate scientist Stefan Rahmstorf, who cautioned that nuclear fusion, despite excitement over recent advances, won’t arrive in time to save us from our waste heat, and might make the problem worse. By providing another cheap source of energy, fusion energy could accelerate both the growth of our energy use and the reckoning of deep warming. A student of Rahmstorf’s, Peter Steiglechner, wrote his master’s thesis on the problem in 2018. Recognition of deep warming and its long-term implications for humanity is spreading. But what can we do about the problem?

Avoiding or delaying deep warming will involve slowing the rise of our waste heat, which means restricting the amount of energy we use and also choosing energy sources that exacerbate the problem as little as possible. Unlike the energy from fossil fuels or nuclear power, which add to our waste energy burden, renewable energy sources intercept energy that is already on its way to Earth, rather than producing additional waste heat. In this sense, the deep warming problem is another reason to pursue renewable energy sources such as solar or wind rather than alternatives such as nuclear fusion, fission or even geothermal power. If we derive energy from any of these sources, we’re unleashing new flows of energy into the Earth system without making a compensating reduction. As a result, all such sources will add to the waste heat problem. However, if renewable sources of energy are deployed correctly, they need not add to our deposition of waste heat in the environment. By using this energy, we produce no more waste heat than would have been created by sunlight in the first place.

Take the example of wind energy. Sunlight first stirs winds into motion by heating parts of the planet unequally, causing vast cells of convection. As wind churns through the atmosphere, blows through trees and over mountains and waves, most of its energy gets turned into heat, ending up in the microscopic motions of molecules. If we harvest some of this wind energy through turbines, it will also be turned into heat in the form of stored energy. But, crucially, no more heat is generated than if there had been no turbines to capture the wind.

The same can hold true for solar energy. In an array of solar cells, if each cell only collects the sunlight falling on it – which would ordinarily have been absorbed by Earth’s surface – then the cells don’t alter how much waste heat gets produced as they generate energy. The light that would have warmed Earth’s surface instead goes into the solar cells, gets used by people for some purpose, and then later ends up as heat. In this way we reduce the amount of heat being absorbed by Earth by precisely the same amount as the energy we are extracting for human use. We are not adding to overall planetary heating. This keeps the waste energy burden unchanged, at least in the relatively near future, even if we go on extracting and using ever larger amounts of energy.

Covering deserts in dark panels would absorb a lot more energy than the desert floor

Chaisson summarised the problem quite clearly in 2008:

I’m now of the opinion … that any energy that’s dug up on Earth – including all fossil fuels of course, but also nuclear and ground-sourced geothermal – will inevitably produce waste heat as a byproduct of humankind’s use of energy. The only exception to that is energy arriving from beyond Earth, this is energy here and now and not dug up, namely the many solar energies (plural) caused by the Sun’s rays landing here daily … The need to avoid waste heat is indeed the single, strongest, scientific argument to embrace solar energies of all types.

But not just any method of gathering solar energy will avoid the deep warming problem. Doing so requires careful engineering. For example, covering deserts with solar panels would add to planetary heating because deserts reflect a lot of incident light back out to space, so it is never absorbed by Earth (and therefore doesn’t produce waste heat). Covering deserts in dark panels would absorb a lot more energy than the desert floor and would heat the planet further.

We’ll also face serious problems in the long run if our energy appetite keeps increasing. Futurists dream of technologies deployed in space where huge panels would absorb sunlight that would otherwise have passed by Earth and never entered our atmosphere. Ultimately, they believe, this energy could be beamed down to Earth. Like nuclear energy, such technologies would add an additional energy source to the planet without any compensating removal of heating from the sunlight currently striking our planet’s surface. Any effort to produce more energy than is normally available from sunlight at Earth’s surface will only make our heating problems worse.

D eep warming is simply a consequence of the laws of physics and our inquisitive nature. It seems to be in our nature to constantly learn and develop new things, changing our environment in the process. For thousands of years, we have harvested and exploited ever greater quantities of energy in this pursuit, and we appear poised to continue along this path with the rapidly expanding use of renewable energy sources – and perhaps even more novel sources such as nuclear fusion. But this path cannot proceed indefinitely without consequences.

The logic that more energy equals more warming sets up a profound dilemma for our future. The laws of physics and the habits ingrained in us from our long evolutionary history are steering us toward trouble. We may have a technological fix for greenhouse gas warming – just shift from fossil fuels to cleaner energy sources – but there is no technical trick to get us out of the deep warming problem. That won’t stop some scientists from trying.

Perhaps, believing that humanity is incapable of reducing its energy usage, we’ll adopt a fantastic scheme to cool the planet, such as planetary-scale refrigeration or using artificially engineered tornadoes to transport heat from Earth’s surface to the upper atmosphere where it can be radiated away to space. As far-fetched as such approaches sound, scientists have given some serious thought to these and other equally bizarre ideas, which seem wholly in the realm of science fiction. They’re schemes that will likely make the problem worse not better.

We will need to transform the human story. It must become a story of doing less, not more

I see several possibilities for how we might ultimately respond. As with greenhouse gas warming, there will probably be an initial period of disbelief, denial and inaction, as we continue with unconstrained technological advance and growing energy use. Our planet will continue warming. Sooner or later, however, such warming will lead to serious disruptions of the Earth environment and its ecosystems. We won’t be able to ignore this for long, and it may provide a natural counterbalance to our energy use, as our technical and social capacity to generate and use ever more energy will be eroded. We may eventually come to some uncomfortable balance in which we just scrabble out a life on a hot, compromised planet because we lack the moral and organisational ability to restrict our energy use enough to maintain a sound environment.

An alternative would require a radical break with our past: using less energy. Finding a way to use less energy would represent a truly fundamental rupture with all of human history, something entirely novel. A rupture of this magnitude won’t come easily. However, if we could learn to view restrictions on our energy use as a non-negotiable element of life on Earth, we may still be able to do many of the things that make us essentially human: learning, discovering, inventing, creating. In this scenario, any helpful new technology that comes into use and begins using lots of energy would require a balancing reduction in energy use elsewhere. In such a way, we might go on with the future being perpetually new, and possibly better.

None of this is easily achieved and will likely mirror our current struggles to come to agreements on greenhouse gas heating. There will be vicious squabbles, arguments and profound polarisation, quite possibly major wars. Humanity will never have faced a challenge of this magnitude, and we won’t face up to it quickly or easily, I expect. But we must. Planetary heating is in our future – the very near future and further out as well. Many people will find this conclusion surprisingly hard to swallow, perhaps because it implies fundamental restrictions on our future here on Earth: we can’t go on forever using more and more energy, and, at the same time, expecting the planet’s climate to remain stable.

The world will likely be transformed by 2050. And, sometime after that, we will need to transform the human story. The narrative arc of humanity must become a tale of continuing innovation and learning, but also one of careful management. It must become a story, in energy terms, of doing less, not more. There’s no technology for entirely escaping waste heat, only techniques.

This is important to remember as we face up to the extremely urgent challenge of heating linked to fossil-fuel use and greenhouse gases. Global warming is just the beginning of our problems. It’s a testing ground to see if we can manage an intelligent and coordinated response. If we can handle this challenge, we might be better prepared, more capable and resilient as a species to tackle an even harder one.

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Human activity affects global surface temperatures by changing Earth ’s radiative balance—the “give and take” between what comes in during the day and what Earth emits at night. Increases in greenhouse gases —i.e., trace gases such as carbon dioxide and methane that absorb heat energy emitted from Earth’s surface and reradiate it back—generated by industry and transportation cause the atmosphere to retain more heat, which increases temperatures and alters precipitation patterns.

Global warming, the phenomenon of increasing average air temperatures near Earth’s surface over the past one to two centuries, happens mostly in the troposphere , the lowest level of the atmosphere, which extends from Earth’s surface up to a height of 6–11 miles. This layer contains most of Earth’s clouds and is where living things and their habitats and weather primarily occur.

Continued global warming is expected to impact everything from energy use to water availability to crop productivity throughout the world. Poor countries and communities with limited abilities to adapt to these changes are expected to suffer disproportionately. Global warming is already being associated with increases in the incidence of severe and extreme weather, heavy flooding , and wildfires —phenomena that threaten homes, dams, transportation networks, and other facets of human infrastructure. Learn more about how the IPCC’s Sixth Assessment Report, released in 2021, describes the social impacts of global warming.

Polar bears live in the Arctic , where they use the region’s ice floes as they hunt seals and other marine mammals . Temperature increases related to global warming have been the most pronounced at the poles, where they often make the difference between frozen and melted ice. Polar bears rely on small gaps in the ice to hunt their prey. As these gaps widen because of continued melting, prey capture has become more challenging for these animals.

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global warming , the phenomenon of increasing average air temperatures near the surface of Earth over the past one to two centuries. Climate scientists have since the mid-20th century gathered detailed observations of various weather phenomena (such as temperatures, precipitation , and storms) and of related influences on climate (such as ocean currents and the atmosphere’s chemical composition). These data indicate that Earth’s climate has changed over almost every conceivable timescale since the beginning of geologic time and that human activities since at least the beginning of the Industrial Revolution have a growing influence over the pace and extent of present-day climate change .

Giving voice to a growing conviction of most of the scientific community , the Intergovernmental Panel on Climate Change (IPCC) was formed in 1988 by the World Meteorological Organization (WMO) and the United Nations Environment Program (UNEP). The IPCC’s Sixth Assessment Report (AR6), published in 2021, noted that the best estimate of the increase in global average surface temperature between 1850 and 2019 was 1.07 °C (1.9 °F). An IPCC special report produced in 2018 noted that human beings and their activities have been responsible for a worldwide average temperature increase between 0.8 and 1.2 °C (1.4 and 2.2 °F) since preindustrial times, and most of the warming over the second half of the 20th century could be attributed to human activities.

AR6 produced a series of global climate predictions based on modeling five greenhouse gas emission scenarios that accounted for future emissions, mitigation (severity reduction) measures, and uncertainties in the model projections. Some of the main uncertainties include the precise role of feedback processes and the impacts of industrial pollutants known as aerosols , which may offset some warming. The lowest-emissions scenario, which assumed steep cuts in greenhouse gas emissions beginning in 2015, predicted that the global mean surface temperature would increase between 1.0 and 1.8 °C (1.8 and 3.2 °F) by 2100 relative to the 1850–1900 average. This range stood in stark contrast to the highest-emissions scenario, which predicted that the mean surface temperature would rise between 3.3 and 5.7 °C (5.9 and 10.2 °F) by 2100 based on the assumption that greenhouse gas emissions would continue to increase throughout the 21st century. The intermediate-emissions scenario, which assumed that emissions would stabilize by 2050 before declining gradually, projected an increase of between 2.1 and 3.5 °C (3.8 and 6.3 °F) by 2100.

Many climate scientists agree that significant societal, economic, and ecological damage would result if the global average temperature rose by more than 2 °C (3.6 °F) in such a short time. Such damage would include increased extinction of many plant and animal species, shifts in patterns of agriculture , and rising sea levels. By 2015 all but a few national governments had begun the process of instituting carbon reduction plans as part of the Paris Agreement , a treaty designed to help countries keep global warming to 1.5 °C (2.7 °F) above preindustrial levels in order to avoid the worst of the predicted effects. Whereas authors of the 2018 special report noted that should carbon emissions continue at their present rate, the increase in average near-surface air temperature would reach 1.5 °C sometime between 2030 and 2052, authors of the AR6 report suggested that this threshold would be reached by 2041 at the latest.

The AR6 report also noted that the global average sea level had risen by some 20 cm (7.9 inches) between 1901 and 2018 and that sea level rose faster in the second half of the 20th century than in the first half. It also predicted, again depending on a wide range of scenarios, that the global average sea level would rise by different amounts by 2100 relative to the 1995–2014 average. Under the report’s lowest-emission scenario, sea level would rise by 28–55 cm (11–21.7 inches), whereas, under the intermediate emissions scenario, sea level would rise by 44–76 cm (17.3–29.9 inches). The highest-emissions scenario suggested that sea level would rise by 63–101 cm (24.8–39.8 inches) by 2100.

The scenarios referred to above depend mainly on future concentrations of certain trace gases, called greenhouse gases , that have been injected into the lower atmosphere in increasing amounts through the burning of fossil fuels for industry, transportation , and residential uses. Modern global warming is the result of an increase in magnitude of the so-called greenhouse effect , a warming of Earth’s surface and lower atmosphere caused by the presence of water vapour , carbon dioxide , methane , nitrous oxides , and other greenhouse gases. In 2014 the IPCC first reported that concentrations of carbon dioxide, methane, and nitrous oxides in the atmosphere surpassed those found in ice cores dating back 800,000 years.

Of all these gases, carbon dioxide is the most important, both for its role in the greenhouse effect and for its role in the human economy. It has been estimated that, at the beginning of the industrial age in the mid-18th century, carbon dioxide concentrations in the atmosphere were roughly 280 parts per million (ppm). By the end of 2022 they had risen to 419 ppm, and, if fossil fuels continue to be burned at current rates, they are projected to reach 550 ppm by the mid-21st century—essentially, a doubling of carbon dioxide concentrations in 300 years.

A vigorous debate is in progress over the extent and seriousness of rising surface temperatures, the effects of past and future warming on human life, and the need for action to reduce future warming and deal with its consequences. This article provides an overview of the scientific background related to the subject of global warming. It considers the causes of rising near-surface air temperatures, the influencing factors, the process of climate research and forecasting, and the possible ecological and social impacts of rising temperatures. For an overview of the public policy developments related to global warming occurring since the mid-20th century, see global warming policy . For a detailed description of Earth’s climate, its processes, and the responses of living things to its changing nature, see climate . For additional background on how Earth’s climate has changed throughout geologic time , see climatic variation and change . For a full description of Earth’s gaseous envelope, within which climate change and global warming occur, see atmosphere .

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Essay on Climate Change: Check Samples in 100, 250 Words

• Updated on  
• Sep 21, 2023

Writing an essay on climate change is crucial to raise awareness and advocate for action. The world is facing environmental challenges, so in a situation like this such essay topics can serve as s platform to discuss the causes, effects, and solutions to this pressing issue. They offer an opportunity to engage readers in understanding the urgency of mitigating climate change for the sake of our planet’s future.

Must Read: Essay On Environment  

Table of Contents

• 1 What Is Climate Change?
• 2 What are the Causes of Climate Change?
• 3 What are the effects of Climate Change?
• 4 How to fight climate change?
• 5 Essay On Climate Change in 100 Words
• 6 Climate Change Sample Essay 250 Words

What Is Climate Change?

Climate change is the significant variation of average weather conditions becoming, for example, warmer, wetter, or drier—over several decades or longer. It may be natural or anthropogenic. However, in recent times, it’s been in the top headlines due to escalations caused by human interference.

What are the Causes of Climate Change?

Obama at the First Session of COP21 rightly quoted “We are the first generation to feel the impact of climate change, and the last generation that can do something about it.”.Identifying the causes of climate change is the first step to take in our fight against climate change. Below stated are some of the causes of climate change:

• Greenhouse Gas Emissions: Mainly from burning fossil fuels (coal, oil, and natural gas) for energy and transportation.
• Deforestation: The cutting down of trees reduces the planet’s capacity to absorb carbon dioxide.
• Industrial Processes: Certain manufacturing activities release potent greenhouse gases.
• Agriculture: Livestock and rice cultivation emit methane, a potent greenhouse gas.

What are the effects of Climate Change?

Climate change poses a huge risk to almost all life forms on Earth. The effects of climate change are listed below:

• Global Warming: Increased temperatures due to trapped heat from greenhouse gases.
• Melting Ice and Rising Sea Levels: Ice caps and glaciers melt, causing oceans to rise.
• Extreme Weather Events: More frequent and severe hurricanes, droughts, and wildfires.
• Ocean Acidification: Oceans absorb excess CO2, leading to more acidic waters harming marine life.
• Disrupted Ecosystems: Shifting climate patterns disrupt habitats and threaten biodiversity.
• Food and Water Scarcity: Altered weather affects crop yields and strains water resources.
• Human Health Risks: Heat-related illnesses and the spread of diseases.
• Economic Impact: Damage to infrastructure and increased disaster-related costs.
• Migration and Conflict: Climate-induced displacement and resource competition.

How to fight climate change?

‘Climate change is a terrible problem, and it absolutely needs to be solved. It deserves to be a huge priority,’ says Bill Gates. The below points highlight key actions to combat climate change effectively.

• Energy Efficiency: Improve energy efficiency in all sectors.
• Protect Forests: Stop deforestation and promote reforestation.
• Sustainable Agriculture: Adopt eco-friendly farming practices.
• Advocacy: Raise awareness and advocate for climate-friendly policies.
• Innovation: Invest in green technologies and research.
• Government Policies: Enforce climate-friendly regulations and targets.
• Corporate Responsibility: Encourage sustainable business practices.
• Individual Action: Reduce personal carbon footprint and inspire others.

Essay On Climate Change in 100 Words

Climate change refers to long-term alterations in Earth’s climate patterns, primarily driven by human activities, such as burning fossil fuels and deforestation, which release greenhouse gases into the atmosphere. These gases trap heat, leading to global warming. The consequences of climate change are widespread and devastating. Rising temperatures cause polar ice caps to melt, contributing to sea level rise and threatening coastal communities. Extreme weather events, like hurricanes and wildfires, become more frequent and severe, endangering lives and livelihoods. Additionally, shifts in weather patterns can disrupt agriculture, leading to food shortages. To combat climate change, global cooperation, renewable energy adoption, and sustainable practices are crucial for a more sustainable future.

Must Read: Essay On Global Warming

Climate Change Sample Essay 250 Words

Climate change represents a pressing global challenge that demands immediate attention and concerted efforts. Human activities, primarily the burning of fossil fuels and deforestation, have significantly increased the concentration of greenhouse gases in the atmosphere. This results in a greenhouse effect, trapping heat and leading to a rise in global temperatures, commonly referred to as global warming.

The consequences of climate change are far-reaching and profound. Rising sea levels threaten coastal communities, displacing millions and endangering vital infrastructure. Extreme weather events, such as hurricanes, droughts, and wildfires, have become more frequent and severe, causing devastating economic and human losses. Disrupted ecosystems affect biodiversity and the availability of vital resources, from clean water to agricultural yields.

Moreover, climate change has serious implications for food and water security. Changing weather patterns disrupt traditional farming practices and strain freshwater resources, potentially leading to conflicts over access to essential commodities.

Addressing climate change necessitates a multifaceted approach. First, countries must reduce their greenhouse gas emissions through the transition to renewable energy sources, increased energy efficiency, and reforestation efforts. International cooperation is crucial to set emission reduction targets and hold nations accountable for meeting them.

In conclusion, climate change is a global crisis with profound and immediate consequences. Urgent action is needed to mitigate its impacts and secure a sustainable future for our planet. By reducing emissions and implementing adaptation strategies, we can protect vulnerable communities, preserve ecosystems, and ensure a livable planet for future generations. The time to act is now.

Climate change refers to long-term shifts in Earth’s climate patterns, primarily driven by human activities like burning fossil fuels and deforestation.

Five key causes of climate change include excessive greenhouse gas emissions from human activities, notably burning fossil fuels and deforestation. 

We hope this blog gave you an idea about how to write and present an essay on climate change that puts forth your opinions. The skill of writing an essay comes in handy when appearing for standardized language tests. Thinking of taking one soon? Leverage Edu provides the best online test prep for the same via Leverage Live . Register today to know more!

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13 ways to save the Earth from climate change

Easy ways to help

We know you love watching videos on your phone. But modern activities— such as plugging in devices, driving cars, and cooling homes—often rely on energy sources such as natural gas, oil, and coal. Those energy sources release a gas called carbon dioxide (CO2) into the atmosphere. When CO2 and other greenhouse gases trap heat that would otherwise escape Earth’s atmosphere, the planet’s temperature rises. That’s called global warming, which causes climate change .

Most scientists believe that climate change is happening and causing rising seas, stronger storms, and shifting habitats for wildlife and people. But you don’t have to give up videos or totally shut down the A/C to fight climate change. Read on to learn how you can help!

Used Goods Are Good

Reduce and reuse as much as possible. Factories emit carbon dioxide when making new products. So instead of buying new stuff, fix your appliances and clothes. Good thing holey jeans are back in style!

Send a postcard

Send a letter, postcard, or drawing to your mayor, government representative, or even the president asking them to do something about climate change.

Slay the vampire

"Vampire" appliances suck energy even when turned off. Kill these monsters by unplugging phone and laptop chargers when not in use, and use power strips for lamps and TVs. (Bonus: It’ll save your parents money on energy bills!)

Close the door

If you see a business with its door wide open in the summer, ask an adult to help you email or talk to an employee about closing it. An open door to an air-conditioned building can let 2.2 tons of carbon dioxide escape over one summer. That’s about as much as a car on a 5,000- mile road trip.

Season your fruit

Try to eat mostly inseason and locally grown fruits and vegetables. This cuts down on the energy used to grow and transport food, which reduces the release of heattrapping gases.Does your favorite ice-cream shop use plastic spoons? Ask an adult to help you talk to the owner about switching to a non-plastic option. Some kinds of spoons are even edible!

Calculate your impact

Use an online carbon footprint calculator to see how much carbon dioxide your actions release. If you know how you’re impacting the planet, you can take steps for change.

Eat your veggies

Livestock such as cows account for some of Earth’s heat-trapping gas emissions. (Yep, it’s the cow toots!) Eating more plants cuts down on the need for so much livestock.

Help out at the hotel

Hang up and reuse your hotel towels instead of washing them after each use. That saves water and energy.

Walk it out

Walk or bike as much as you can. Biking or walking just one mile a day for a year could save 330 pounds of carbon dioxide—that’s the same as planting four trees and letting them grow for 10 years!

Spread the word

Write a letter to the editor about climate change in your local or school newspaper. The more people talk about the issue, the better!

Wear a warm sweater instead of turning up the heat, and open your windows and turn on a fan instead of blasting the air conditioner.

Be a science champion

Not everyone understands climate change. Learn the facts and talk to your friends and family. If everyone gets the science, we can work together to find solutions.

Hang up your freshly washed clothes to dry. You’ll be saving energy by not using the dryer and helping with chores.

Photo credits: Adobe Stock / jzehnder (smokestack); Katalinks, Shutterstock (vampire); Nate Allred, Shutterstock (cow); Photograph by iofoto, Shutterstock (bikes); Alex Staroseltsev, Shutterstock (strawberry); Cookie Studio, Shutterstock (sweater); Mike Flippo, Shutterstock (clothes)

Explore more

Learn about plastic and how to reduce your use., save the earth, save the earth tips, endangered species act.

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Goal 13: Take urgent action to combat climate change and its impacts

Every person, in every country in every continent will be impacted in some shape or form by climate change. There is a climate cataclysm looming, and we are underprepared for what this could mean.

Climate change is caused by human activities and threatens life on earth as we know it. With rising greenhouse gas emissions, climate change is occurring at rates much faster than anticipated. Its impacts can be devastating and include extreme and changing weather patterns and rising sea levels.

If left unchecked, climate change will undo a lot of the development progress made over the past years. It will also provoke mass migrations that will lead to instability and wars.

To limit global warming to 1.5°C above pre- industrial levels, emissions must already be decreasing and need to be cut by almost half by 2030, just seven years away. But, we are drastically off track from this target.

Urgent and transformative going beyond mere plans and promises are crucial. It requires raising ambition, covering entire economies and moving towards climate-resilient development, while outlining a clear path to achieve net-zero emissions. Immediate measures are necessary to avoid catastrophic consequences and secure a sustainable future for generations to come.

The climate crisis continues unabated as the global community shies away from the full commitment required for its reversal. 2010 – 2019 was the warmest decade ever recorded, bringing with it massive wildfires, hurricanes, droughts, floods and other climate disasters across continents.

Climate change is disrupting national economies and affecting lives and livelihoods, especially for the most vulnerable.

Between 2010 and 2020, highly vulnerable regions, home to approximately 3.3–3.6 billion people, experienced 15 x higher human mortality rates from floods, droughts and storms compared to regions with very low vulnerability.

What happens if you don’t take action?

If left unchecked, climate change will cause average global temperatures to increase beyond 3°C, and will adversely affect every ecosystem. Already, we are seeing how climate change can exacerbate storms and disasters, and threats such as food and water scarcity, which can lead to conflict. Doing nothing will end up costing us a lot more than if we take action now.

Solving the problem

To address climate change, we have to vastly raise our ambition at all levels. Much is happening around the world – investments in renewable energy have soared. But more needs to be done. The world must transform its energy, industry, transport, food, agriculture and forestry systems to ensure that we can limit global temperature rise to well below 2°C, maybe even 1.5°C. In December 2015, the world took a significant first step by adopting the Paris Agreement, in which all countries committed to take action to address climate change. However, more actions are critically needed in order to meet the targets.

Businesses and investors need to ensure emissions are lowered, not just because it is the right thing to do, but because it makes economic and business sense as well.

Are we investing enough to combat climate change?

According to the UNFCCC, global climate finance flows reached an annual average of $803 billion in 2019–2020, a 12 per cent increase compared to prior years. However, this still falls short of the levels needed to limit warming, and fossil-fuel-related flows exceeded climate financing for adaptation and mitigation in 2020.

In 2019, at least 120 of the 153 developing countries had undertaken activities to formulate and implement National Adaptation Plans to enhance climate adaptation and resilience, an increase of 29 countries over the previous year. Furthermore, progress in meeting the 2020 disaster risk reduction target has been slow.

What can I do to help?

There are many things that each of us can do as individuals. To find out what you can do, go to: www.un.org/en/actnow

To read more about the UN’s efforts on climate change: un.org/climatechange

Facts and figures

Goal 13 targets.

• With a climate cataclysm looming, the pace and scale of current climate action plans are wholly insufficient to effectively tackle climate change. Increasingly frequent and intense extreme weather events are already impacting every region on Earth. Rising temperatures will escalate these hazards further, posing grave risks.
• The Intergovernmental Panel on Climate Change (IPCC) emphasizes that deep, rapid and sustained reductions in greenhouse gas (GHG) emissions are essential in all sectors, beginning now and continuing throughout this decade. To limit global warming to 1.5°C above pre- industrial levels, emissions must already be decreasing and need to be cut by almost half by 2030, just seven years away.
• Urgent and transformative action is crucial, going beyond mere plans and promises. It requires raising ambition, covering entire economies and moving towards climate-resilient development, while outlining a clear path to achieve net-zero emissions. Time is running out, and immediate measures are necessary to avoid catastrophic consequences and secure a sustainable future for generations to come.

Source: The Sustainable Development Goals Report 2023

13.1  Strengthen resilience and adaptive capacity to climate-related hazards and natural disasters in all countries

13.2  Integrate climate change measures into national policies, strategies and planning

13.3  Improve education, awareness-raising and human and institutional capacity on climate change mitigation, adaptation, impact reduction and early warning

13.A  Implement the commitment undertaken by developed-country parties to the United Nations Framework Convention on Climate Change to a goal of mobilizing jointly $100 billion annually by 2020 from all sources to address the needs of developing countries in the context of meaningful mitigation actions and transparency on implementation and fully operationalize the Green Climate Fund through its capitalization as soon as possible

13.B  Promote mechanisms for raising capacity for effective climate change-related planning and management in least developed countries and small island developing States, including focusing on women, youth and local and marginalized communities

*Acknowledging that the United Nations Framework Convention on Climate Change is the primary international, intergovernmental forum for negotiating the global response to climate change.

UN and climate change site

UN Framework on the Convention on Climate Change

World Meteorological Organization

UN Population Fund

UN Environment – Climate Change

Intergovernmental panel on Climate Change

FAO – Climate

Fast Facts: Climate Action

Infographic: Climate Action

Climate Action Summit 2019

With global emissions are reaching record levels and showing no sign of peaking, UN Secretary-General António Guterres called on all leaders to come to New York on 23 September 2019 for the Climate Action Summit with concrete, realistic plans to enhance their nationally determined contributions by 2020, in line with reducing greenhouse gas emissions by 45 per cent over the next decade, and to net zero emissions by 2050.

Read the Report of the Secretary-General on the outcomes of the Summit.

IPCC Climate Report 2022

The Working Group III report provides an updated global assessment of climate change mitigation progress and pledges, and examines the sources of global emissions. It explains developments in emission reduction and mitigation efforts, assessing the impact of national climate pledges in relation to long-term emissions goals.

Read more here

The Paris Agreement on climate change

The UN continues to encourage all stakeholders to take action toward reducing the impacts of climate change.

COP27: Egypt, 2022

From 6 to 18 November, Heads of State, ministers and negotiators, along with climate activists, mayors, civil society representatives and CEOs will meet in the Egyptian coastal city of Sharm el-Sheikh for the largest annual gathering on climate action.

The 27th Conference of the Parties to the United Nations Framework Convention on Climate Change –  COP27  – will build on the outcomes of  COP26  to deliver action on an array of issues critical to tackling the climate emergency – from urgently reducing greenhouse gas emissions, building resilience and adapting to the inevitable impacts of climate change, to delivering on the commitments to finance climate action in developing countries.

COP26: Glasgow, 2021

The UN Climate Change Conference in Glasgow (COP26) brought together 120 world leaders and over 40,000 registered participants, including 22,274 party delegates, 14.124 observers and 3.886 media representatives. For two weeks, the world was riveted on all facets of climate change — the science, the solutions, the political will to act, and clear indications of action.

The outcome of COP26 – the  Glasgow Climate Pact  – is the fruit of intense negotiations among almost 200 countries over the two weeks, strenuous formal and informal work over many months, and constant engagement both in-person and virtually for nearly two years.

COP25: Madrid, 2019

The Madrid Climate Change Conference – COP25 – brought the world together to consider ways to strengthen the implementation of the Paris Agreement. Taking place from 2 to 16 December in Madrid, the Conference came at a time when new data shows the climate emergency is getting worse every day, and is impacting people’s lives everywhere, whether from extreme heat, air pollution, wildfires, intensified flooding or droughts. Read our blogs from the Conference here .

COP24: Katowice, 2018

At the end of COP24, countries stressed “the urgency of enhanced ambition in order to ensure the highest possible mitigation and adaptation efforts by all Parties,” and agreed on a set of guidelines for implementing the landmark 2015 Paris Climate Change Agreement.

COP23: Bonn, 2017

The 2017 UN Climate Conference took place in Bonn, Germany, from 6-18 November. Leaders of national governments, cities, states, business, investors, NGOs and civil society gathered to speed up climate action to meet the goals of the Paris Climate Change Agreement.

COP22: Marrakesh, 2016

High-Level Event Towards Entry into Force: 21 September, 2016

Recap of the High-Level Event Towards Entry into Force

Paris Agreement Signing Ceremony, 22 April 2016

To keep the global spotlight focused on climate change and build on the strong political momentum from Paris, United Nations Secretary-General Ban Ki-moon invited representatives of all countries to sign  the Paris Agreement on climate change   at a special Ceremony at the United Nations Headquarters on 22 April.

COP21, 12 December 2015

The Paris Agreement was adopted by all 196 Parties to the  United Nations Framework Convention on Climate Change  at  COP21 in Paris  on 12 December 2015. In the agreement, all countries agreed to work to limit global temperature rise to well below 2 degrees Celsius, and given the grave risks, to strive for 1.5 degrees Celsius. Implementation of the Paris Agreement is essential for the achievement of the  Sustainable Development Goals , and provides a roadmap for climate actions that will reduce emissions and build climate resilience.

Paris Agreement – Frequently Asked Questions

What is the present status of the paris agreement on climate change.

The Paris Agreement on climate change officially entered into force on 4 November 2016, after 55 countries accounting for 55 per cent of the total global greenhouse gas emissions, deposited their instruments of ratification, acceptance or approval with the UN Secretary-General.

As of 28 September 2017, 166 countries have joined the Paris Agreement.

What is the next step towards the implementation of the Paris Agreement?

What are the most significant aspects about the new agreement.

The agreement provides a pathway forward to limit temperature rise to well below 2 degrees, maybe even 1.5. The agreement provides a mechanism to increase the level of ambition.

The Paris Agreement is an ambitious, dynamic and universal agreement. It covers all countries and all emissions, and is designed to last. This is a monumental agreement. It solidifies international cooperation for climate change. It provides a way forward.

The Paris Agreement sends a powerful signal to markets that now is the time to invest in the low emission economy. It contains a transparency framework to build mutual trust and confidence.

It will serve as an important tool in mobilizing finance technological support and capacity building for developing countries. And it will also help to scale up global efforts to address and minimize loss and damage from climate change.

Paris is a beginning—we now have to implement the Agreement. But we have taken a giant step forward.

Is this agreement really going to help?

The agreement is ambitious and it provides all the tools we need to address climate change, for reducing emissions and to adapt to the impacts of climate change.

The proof will be in the implementation, by governments, businesses and civil society.

What does the agreement require countries to do?

Countries officially submitted their own nationally determined climate actions. They have an obligation to implement these plans, and if they do, it will bend the curve downward in the projected global temperature rise.

The agreement not only formalizes the process of developing national plans, but also it provides a binding requirement to assess and review progress on these plans. This mechanism will require countries to continuously upgrade their commitments and ensure that there will be no backtracking.

This agreement is a clarion call from governments that they are ready for implementing the 2030 Sustainable Development Agenda.

What happens if a country doesn’t live up to its commitments? Would there be any enforcement?

There is no benefit to flouting the Agreement. Any short-term time gain will be short-lived. It will undoubtedly be overshadowed by negative reactions, by other countries, financial markets, and most important, by their citizens.

Developing countries stressed the need for equity and fairness. Does the Agreement provide that?

How can paris get us to the 2 degree—or even 1.5 degree goal.

We have an agreement and we have a chance now to reach our goal. We couldn’t say that without an agreement. The Paris Agreement will put us on a pathway to achieve the 2 degree goal or less. We did not expect to leave Paris with commitments to reach that goal, but rather, with a process that will get us there. And that is what the Agreement provides.

How are climate change and the Paris Agreement linked with the Sustainable Development Goals?

The Paris Conference featured thousands of climate action announcements that demonstrated how civil society and the private sector are moving forward to address climate change.

Why is it so urgent that we do something now?

We can limit global temperature rise to less than 2 degrees if we take action now. We need all countries and all sectors of society to act now—it is in the interests of everyone.

It is doable. Taking climate action now makes good economic sense. The more we delay, the more we pay. We can promote economic growth, eradicate extreme poverty, and improve people’s health and well-being by acting today.

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Launch of secretary-general’s youth advisory group on climate change – 27 july.

Building on the climate action momentum, the Secretary-General will launch his Youth Advisory Group on Climate Change on 27 July to amplify youth voices and to engage young people in an open and transparent dialogue as the UN gears up to raise ambition and accelerate action to address the climate crisis.

ActNow Climate Campaign – Chef Grace Ramirez

Chef Grace Ramirez talks about sustainability and green hacks in support of the UN's ActNow climate campaign.

Angry Birds 2 PSA in support of the ActNow Climate Campaign

The Department of Global Communications is partnering with Sony Pictures Entertainment and the UN Foundation for a second time on an initiative to promote the Sustainable Development Goal 13 – take urgent action against climate change and its impacts.

How Do Governments Combat Climate Change?

In this free resource, explore seven ways countries are responding to a changing environment, from cap and trade policies to clean energy standards.

Actor Joaquin Phoenix (center) stands with protestors waiting to be arrested on the steps of the U.S. Capitol Building during a climate change protest and rally on Capitol Hill on January 10, 2020 in Washington, D.C.

Source: Paul Morigi/Getty Images

Have you ever brought a reusable tote bag to the grocery store? Or refilled a water bottle rather than buying a disposable one? Do you separate your recycling from your trash? 

If you answered yes to any of those questions, you’re not alone. In the United States, more than half of all adults claim to have taken some action to protect the environment. But will individual actions be enough to address the massive, transnational challenge of climate change? Unfortunately, no.

Almost all experts agree that governments—not just individuals or private businesses—play a critical role in the fight against climate change. However, they disagree on the most effective options to address the problem. This resource outlines seven policies aimed at combating climate change and explores their potential upsides and downsides for society.

U.S. Senators Claire McCaskill, Sherrod Brown, and Robert Menendez, during a news conference announcing legislation aimed at ending subsidies to the five largest oil companies, on May 10, 2011.

Source: Scott J. Ferrell/Congressional Quarterly via Getty Images

Carbon taxes

Greenhouse gas emissions , such as carbon dioxide, pollute the atmosphere and change the climate. Carbon taxes attempt to minimize those emissions by requiring the largest greenhouse gas producers—for instance, coal-fired power plants—to pay for the damage they cause. By attaching fees to emissions, carbon taxes encourage people, businesses, and governments to emit less.

Governments can use the revenue generated from these fees to pay for social programs, invest in clean energy, or lower taxes for the public. However, some experts believe carbon taxes cause economic strain for people in lower income brackets. For example, if electric companies respond to carbon taxes by raising prices, the increase can disproportionately affect low-income households, which on average spend greater percentages of their earnings on utilities than wealthier households do.

Where it worked: Since becoming one of the first countries to implement a national carbon tax in 1991, Sweden has successfully lowered its greenhouse gas emissions by 27 percent. And although critics believed the tax would stunt the economy, Sweden’s gross domestic product has since doubled. Today, more than thirty countries have implemented a national carbon tax, including Argentina, Canada, Japan, Singapore, and Ukraine.

An onshore processing facility at the Prigorodnoye production complex of the Sakhalin Energy Company on the southern shore of Sakhalin Island, Russia, on July 14, 2021.

Source: Yuri Smityuk/TASS via Getty Images

Cap and trade

The term cap and trade refers to a government program designed to limit (or cap) private-sector greenhouse gas emissions . In cap and trade systems, governments allocate or sell a set number of permits, each of which represents the right to emit a specific amount of greenhouse gases . If a company needs more permits to make its product, it has to trade with another company to buy them. So, as with a carbon tax , companies directly pay for their pollution. 

However, unlike carbon taxes, cap and trade programs ensure emissions in a city or country do not exceed a designated limit. Today, thirteen U.S. states, China, Mexico, and every country in the European Union have implemented cap and trade systems. But experts disagree on whether these policies are more effective than carbon taxes at limiting emissions.

Where it worked: In 2013, California launched one of the United States’ first cap and trade programs. As a result, the state’s emissions fell by 10 percent between 2013 and 2018.

Electric cars stand in front of a charging station in a residential area in the Prenzlauer Berg district of Berlin on September 2, 2021.

Source: Carsten Koall/Picture Alliance via Getty Images

Clean energy standards

Electricity generation accounts for 31  percent of U.S. greenhouse gas emissions . To decrease emissions, around two-thirds of U.S. states have implemented clean energy standards—laws that encourage utility companies to generate a certain percentage of their electricity from low-emission energy sources, such as solar or wind power. However, each state’s standard varies in how it defines clean energy, what percentage of low-emission energy it requires or recommends, and whether the standard is mandatory or voluntary.

Where it worked: In 1999, Texas instituted a clean energy standard to source ten thousand megawatts of electricity—enough energy to power a thousand homes for a year—from renewable energy by 2025. This standard helped kick start growth in the state’s renewable energy sector, and by 2010, Texas had surpassed its goal for 2025. Today, Texas generates around 25 percent of its electricity from renewable sources. However, the state’s fossil fuel sector still leads the country in greenhouse gas emissions.

Youth activist Greta Thunberg speaks at the Climate Action Summit at the United Nations on September 23, 2019 in New York City.

Source: Stephanie Keith/Getty Images

International agreements

In 2020, UN Secretary-General Antonio Guterres announced the world needed to reach net-zero greenhouse gas emissions by 2050 in order to limit global warming to 1.5°C. His statement made one thing clear: climate change is a global problem that requires a global response. 

Over the past three decades, countries have worked together to coordinate this response through international agreements such as the Kyoto Protocol . However, those agreements have varied in effectiveness, with countries disagreeing on goals for emissions reductions and rules on how to enforce emissions cuts. 

Where it worked: One of the most significant climate agreements in history, the Paris Agreement requires its almost two hundred signatories to set individual goals to reduce greenhouse gas emissions. Nearly every country in the world has signed on, and over sixty countries (including top emitters the United States and China) have pledged to achieve net-zero emissions by 2060. Although participation in the voluntary agreement is near universal, experts believe countries’ pledges are not ambitious enough to meet the agreement’s target of limiting global warming to 1.5°C.

A family takes shelter on the rooftop as river embankments have broken and several villages flooded on May 28, 2021 in South 24 Parganas, West Bengal, India.

Source: Dipayan Bose/NurPhoto via Getty Images

Adaptation policies

Extreme weather events such as heat waves, droughts, and floods are getting worse. To address these consequences of climate change, governments have instituted adaptation policies aimed at making cities, states, and even countries less vulnerable to these disasters. 

Adaptation policies range from creating evacuation plans to building roads and bridges that can withstand rising sea levels and extreme weather conditions. Some governments have also turned to innovative strategies such as building public parks that can absorb and store water in the event of floods.

Where it worked: Many governments are trying to ensure their adaptation programs serve the needs of low-income communities, whom climate change will most greatly affect. For instance, the United States’ Low-Income Home Energy Assistance Program helps vulnerable communities cover heating and cooling costs during heat waves or severe winters. Health departments in cities such as New York and Paris have also created public cooling centers to protect their citizens who lack access to air conditioning. And in Philadelphia, the city even sponsored “Beat the Heat” block parties to distribute air conditioners, fans, and ice water to local residents.

People walk past the New York Stock Exchange on a rainy day in the Financial District on October 11, 2018 in New York City.

Source: Drew Angerer/Getty Images

Minimizing financial risks of climate change

On the world’s current climate trajectory, researchers predict the global economy could lose up to $23 trillion per year by 2100 due to climate factors such as falling crop yields, increasing disease rates, and rising sea levels. For comparison, that’s around double the global economic losses from the 2008 financial crisis. 

To avoid future financial instability, governments have begun implementing policies to prepare for climate-related economic shocks. These policies include mandating that all citizens have access to fire insurance and requiring that banks disclose whether climate change has the potential to affect their investments.

Where it worked: Countries such as the United Kingdom run financial stress tests to determine whether a bank or financial system has enough money to function in the event of a disaster. For example, say the Thames River overflows and destroys houses across London; these simulations would check whether banks have enough money to give out loans for home repairs and survive the loss of revenue from fewer home sales.

Solar panels produce renewable energy at the photovoltaic park in Les Mees, in the department of Alpes-de-Haute-Provence, in southern France on March 31, 2015.

Source: Source: Jean-Paul Pelissier/Reuters

Tech investment

From the internet to self-driving cars, governments have long invested in cutting-edge technology. And for the past few decades, many have supported the research and development of technology designed to greatly reduce greenhouse gas emissions. Let’s take a closer look at a few of those technologies.

Renewable energy :  A majority of the world’s energy comes from fossil fuels such as petroleum, natural gas, and coal. In recent decades, many governments have begun investing in low-emission alternatives to fossil fuels called renewable energy technologies, which harness energy generated by natural resources including wind and the sun. Because the cost of producing renewable energy has fallen by as much as 88 percent in the past decade, some experts predict renewable sources could produce more than half of the world’s electricity as soon as 2035.

Nuclear energy uses fission —a reaction that occurs when splitting an atom—to generate electricity without producing greenhouse gas emissions . In Biden's IRA package, a $6 billion dollar program was launched to support the nuclear energy sector, which accounts for nearly 20 percent of the country's electricity generation. This funding arose just as the number of nuclear reactors has stagnated in recent decades, in part due to high-profile disasters at nuclear plants such as Chernobyl and Fukushima. Although regulatory bodies hold nuclear plants to strict safety standards, polls show that many Americans still fear nuclear power is unsafe, raising challenges for the expansion of nuclear power in the United States.

Carbon capture: As of 2021, emissions from factories and power plants make up nearly half of total greenhouse gas emissions in the United States. But with carbon capture technology, factories and power plants can cut their emissions by up to 90 percent by capturing and storing the carbon they produce underground instead of sending it into the atmosphere. However, existing carbon capture technology is costly and therefore not widely adopted.

Geoengineering projects aim to change natural systems to combat climate change. They typically fall into two categories: those that remove carbon directly from the atmosphere and those that drop global temperatures by reflecting sunlight away from the planet. These projects involve anything from planting billions of trees to sending giant mirrors into Earth’s orbit. However, critics point out that some forms of geoengineering could potentially have dangerous unintended consequences for the environment.

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The Science of Climate Change Explained: Facts, Evidence and Proof

Definitive answers to the big questions.

Credit... Photo Illustration by Andrea D'Aquino

Supported by

By Julia Rosen

Ms. Rosen is a journalist with a Ph.D. in geology. Her research involved studying ice cores from Greenland and Antarctica to understand past climate changes.

• Published April 19, 2021 Updated Nov. 6, 2021

The science of climate change is more solid and widely agreed upon than you might think. But the scope of the topic, as well as rampant disinformation, can make it hard to separate fact from fiction. Here, we’ve done our best to present you with not only the most accurate scientific information, but also an explanation of how we know it.

How do we know climate change is really happening?

• How much agreement is there among scientists about climate change?
• Do we really only have 150 years of climate data? How is that enough to tell us about centuries of change?
• How do we know climate change is caused by humans?
• Since greenhouse gases occur naturally, how do we know they’re causing Earth’s temperature to rise?
• Why should we be worried that the planet has warmed 2°F since the 1800s?
• Is climate change a part of the planet’s natural warming and cooling cycles?
• How do we know global warming is not because of the sun or volcanoes?
• How can winters and certain places be getting colder if the planet is warming?
• Wildfires and bad weather have always happened. How do we know there’s a connection to climate change?
• How bad are the effects of climate change going to be?
• What will it cost to do something about climate change, versus doing nothing?

Climate change is often cast as a prediction made by complicated computer models. But the scientific basis for climate change is much broader, and models are actually only one part of it (and, for what it’s worth, they’re surprisingly accurate ).

For more than a century , scientists have understood the basic physics behind why greenhouse gases like carbon dioxide cause warming. These gases make up just a small fraction of the atmosphere but exert outsized control on Earth’s climate by trapping some of the planet’s heat before it escapes into space. This greenhouse effect is important: It’s why a planet so far from the sun has liquid water and life!

However, during the Industrial Revolution, people started burning coal and other fossil fuels to power factories, smelters and steam engines, which added more greenhouse gases to the atmosphere. Ever since, human activities have been heating the planet.

Where it was cooler or warmer in 2020 compared with the middle of the 20th century

Global average temperature compared with the middle of the 20th century

+0.75°C

–0.25°

30 billion metric tons

Carbon dioxide emitted worldwide 1850-2017

Rest of world

Other developed

European Union

Developed economies

Other countries

United States

E.U. and U.K.

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