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The adaptation strategies provided below are intended to inform and assist communities in identifying potential alternatives. They are illustrative and are presented to help communities consider possible ways to address anticipated current and future climate threats to contaminated site management.

Stormwater Runoff

Apply Green Infrastructure Strategies

Use Bioretention to collect stormwater runoff
Bioretention is an adapted landscape feature that provides onsite storage and infiltration of collected stormwater runoff. Stormwater runoff is directed from surfaces to a shallow depression that allows runoff to pond prior to infiltration in an area that is planted with water-tolerant vegetation. As runoff accumulates, it will pond and slowly travel through a filter bed (pictured on the right) where it either infiltrates into the ground or is discharged via an underdrain. Small-scale bioretention areas are often referred to as rain gardens.

Use Blue Roof to hold precipitation after a storm event and discharge it at a controlled rate
A blue roof is designed to hold up to eight inches of precipitation on its surface or in engineered trays. It is comparable to a vegetated roof without soil or vegetation. After a storm event, precipitation is stored on the roof and discharged at a controlled rate. Blue roofs greatly decrease the peak discharge of runoff and also allow water to evaporate into the air prior to being discharged.20 Precipitation discharge is controlled on a blue roof through a flow restriction device around a roof drain. The water can either be slowly released to a storm sewer system or to another GI practice such as a cistern or bioretention area.

Use Permeable pavement to allow runoff to flow through and be temporarily stored prior to discharge
Permeable pavement includes both pavements and pavers with void space that allow runoff to flow through the pavement (pictured left). Once runoff flows through the pavement, it is temporarily stored in an underground stone base prior to infiltrating into the ground or discharging from an under drain. Permeable pavers are highly effective at removing heavy metals, oils, and grease in runoff. Permeable pavement also removes nutrients such as phosphorous and nitrogen. Soil and engineered media filter pollutants as the runoff infiltrates through the porous surface. The void spaces in permeable pavement surfaces and reservoir layers provide storage capacity for runoff. All permeable pavement systems reduce runoff peak volume.

Use Underground storage systems to detain runoff in underground receptacles
Underground storage systems vary greatly in design. Underground storage systems detain runoff in underground receptacles that slowly release runoff. Often the underground receptacles are culverts, engineered stormwater detention vaults, or perforated pipes. One of the benefits of underground storage is that it does not take up additional surface area and can be implemented beneath roadways, parking lots, or athletic fields. Underground storage systems are typically designed to store large volumes of runoff and therefore can have a significant impact in reducing flooding and peak discharges.

Use a stormwater tree trench to store and filter stormwater runoff
A stormwater tree trench is a row of trees that is connected by an underground infiltration structure. At the ground level, trees planted in a tree trench do not look different than any other planted tree. Underneath the sidewalk, the trees sit in a trench that is engineered with layers of gravel and soil that store and filter stormwater runoff. Stormwater tree trenches provide both water quality and runoff reduction benefits.

Use a retention pond to manage stormwater
A retention pond is one of the earliest prototypes of GI, and is now considered a more traditional type of stormwater infrastructure because it has been integrated into gray infrastructure design. It is an engineered stormwater basin designed to store runoff and release it at a controlled rate while maintaining a level of ponded water. Pollutants and sediment loads are reduced as the runoff is retained in the basin. Retention ponds are a very common stormwater management practice and may be designed with sustainable elements to increase water quality and decrease peak discharges. Vegetated forebays may be added to increase sediment removal as well as provide habitat. Another enhancement to traditional stormwater retention ponds is the addition of an iron enhanced sand filter bench that removes dissolved substances such as phosphorus from runoff.

Use extended detention wetlands to reduce flood risk and provide water quality and ecological benefits
Extended detention wetlands, such as the one shown in the figure on the right, may be designed as a flood mitigation strategy that also provides water quality and ecological benefits. Extended detention wetlands can require large land areas, but come with significant flood storage benefits. Extended detention wetlands can be created, restored (from previously filled wetlands), or enhanced existing wetlands. Wetlands typically store flood water during a storm and release it slowly, thereby reducing peak flows. An extended detention wetland allows water to remain in the wetland area for an extended period of time, which provides increased flood storage as well as water quality benefits.29 Extended detention wetlands are distinct from preservation of existing wetlands, but the two practices often are considered together as part of a watershed-based strategy.

Use Climate & Land Use Data

Consider how current design standards are formulated a starting point to the discussion
Rather than starting a conversation with a discussion of climate change projections, understand the current design standard for stormwater management. Then, engage decision makers to seek agreement on a threshold (e.g., the community will prepare for X storm) that is informed by historic data and reflects the risk tolerance of the community (e.g., what level of damage or disruption the community can tolerate at different costs). This also entails understanding the current design standard and whether performance can be enhanced for projects in the region.

Demonstrate the use of dynamical downscaling on research projects at the site scale
Decision makers can use local resources for climate change data from researchers at organizations within the area, such as universities, state meteorological agencies, and other organizations that may be involved in downscaling of climate change scenarios.

Develop a "wish-list" of data that should be collected to improve understanding of climate changes
Stormwater managers and geographic information system (GIS) staff can begin to collect this needed local data (e.g., establish and maintain more local weather gauges and monitoring stations). Partners in the community or neighboring jurisdictions may also be interested in pooling resources to develop or improve data sets.

Use resources to show historical and future trend lines
To understand future climate changes, techniques that use historic data, such as analogue events or other sensitivity and threshold information in the historic record, can be used as illustrations (e.g., see the IPCC [Intergovernmental Panel on Climate Change] report Climate Change 2001: Working Group II: Impacts, Adaptation, and Vulnerability, Section 3.5. EPA's SWC and SWMM-CAT provide regional downscaled climate projections. EPA is also developing a web application for visualizing and downloading climate model output: the Global Change Explorer.

Use Natural Infrastructure

Build swales and rain gardens
Water temperature benefits include getting water underground and maintains aquifers. Other benefits can included keeping stormwater runoff out of waterways.

Control stormwater runoff
Water temperature benefits include reducing high peak flows that contribute to erosion and channel changes. Other benefits can include restoring natural hydrology, returning to natural sediment transport and geomorphology, reestablishing natural disturbance, and raising water quality.

Plant trees
Water temperature benefits include shading the ground and keeping water temperature cooler. Other benefits can include controlling stormwater runoff and promoting infiltration.

Promote stormwater infiltration
Water temperature benefits include getting water into aquifers and away from exposure to sun, and recharging groundwater that supplies baseflow that regulates stream temperature. Other benefits can include restoring natural hydrology, returning to natural sediment transport and geomorphology, and reestablishing natural disturbance.

Erosion and Sedimentation

Apply Green Infrastructure Strategies

Use Underground storage systems to detain runoff in underground receptacles
Underground storage systems vary greatly in design. Underground storage systems detain runoff in underground receptacles that slowly release runoff. Often the underground receptacles are culverts, engineered stormwater detention vaults, or perforated pipes. One of the benefits of underground storage is that it does not take up additional surface area and can be implemented beneath roadways, parking lots, or athletic fields. Underground storage systems are typically designed to store large volumes of runoff and therefore can have a significant impact in reducing flooding and peak discharges.

Use a retention pond to manage stormwater
A retention pond is one of the earliest prototypes of GI, and is now considered a more traditional type of stormwater infrastructure because it has been integrated into gray infrastructure design. It is an engineered stormwater basin designed to store runoff and release it at a controlled rate while maintaining a level of ponded water. Pollutants and sediment loads are reduced as the runoff is retained in the basin. Retention ponds are a very common stormwater management practice and may be designed with sustainable elements to increase water quality and decrease peak discharges. Vegetated forebays may be added to increase sediment removal as well as provide habitat. Another enhancement to traditional stormwater retention ponds is the addition of an iron enhanced sand filter bench that removes dissolved substances such as phosphorus from runoff.

Consider Cost and Benefits of Green Infrastructure

Consider long-term benefits of green infrastructure in economic analysis of stormwater management plans
Train local appraisers/commissioners to capture the full value of green infrastructure. Incorporate cobenefits into ROI calculations, such as ecosystem services and quality of life factors.

Use Natural Infrastructure

Control soil erosion in the watershed
Water temperature benefits include keeping sediment from clogging streambeds and interfering with groundwater exchange and keeping heat-trapping particles out of waterways. Other benefits can include returning to natural sediment transport and geomorphology, and raising water quality.

Control stream bank erosion
Water temperature benefits include keeping stream channels from getting wider and shallower and warming more easily. Other benefits can include maintaining natural sediment transport and geomorphology, and raising water quality.

Harmful Algal Blooms

Develop models to understand potential water quality changes
In many areas, increased water temperatures will cause eutrophication and excess algal growth, which will reduce drinking water quality. The quality of drinking water sources may also be compromised by increased sediment or nutrient inputs due to extreme storm events. These impacts may be addressed with targeted watershed management plans.

Manage reservoir water quality
Changes in precipitation and runoff timing, coupled with higher temperatures due to climate change, may lead to diminished reservoir water quality. Reservoir water quality can be maintained or improved by a combination of watershed management, to reduce pollutant runoff and promote groundwater recharge and reservoir management methods, such as lake aeration.

Install effluent cooling systems
Higher surface temperatures may contribute to making water quality standards or make temperature criteria more difficult to attain, as well as lead to greater outbreaks of harmful algal blooms. Therefore, efforts to reduce the temperature of treated wastewater discharges, such as additional effluent cooling systems, may be needed to help maintain water quality.

Visit the Water Utility Source Water Quality Page - to view more Adaptation Strategies that can help support efforts to reduce water quality impacts from harmful algal blooms.

Source Documents

These strategies are adapted from existing EPA, CDC and other federal resources. Please view these strategies in the context provided by the primary source documents:

Disclaimer

The adaptation strategies provided are intended to inform and assist communities in identifying potential alternatives. They are illustrative and are presented to help communities consider possible ways to address anticipated current and future climate threats to contaminated site management. Read the full disclaimer.

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Climate Impacts on Water Quality | US EPA

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The adaptation strategies provided below are intended to inform and assist communities in identifying potential alternatives. They are illustrative and are presented to help communities consider possible ways to address anticipated current and future climate threats to contaminated site management.

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https://books.google.com/books?hl=en&lr=&id=zkx5lKCADisC&oi=fnd&pg=PA2&dq=climate+change&ots=gX9GayLMcG&sig=gq4YUAmQYVBShGYS6QugNo0zXmM#v=onepage&q=climate%20change&f=false

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Where we work

We work in four tropical forest ecosystems that are critical for biodiversity conservation and climate change mitigation.
‍
In each location, we partner with local and indigenous communities, organizations, and governments, to build durable conservation solutions led by local communities and stakeholders.

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We work in four tropical forest ecosystems that are critical for biodiversity conservation and climate change mitigation.‍ In each location, we partner with local and indigenous communities, organizations, and governments, to build durable conservation solutions led by local communities and stakeholders.

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Earth Science, Climatology

Image

Photograph by Emory Kristof/ National Geographic

Global warming is the long-term warming of the planet's overall temperature. Though this warming trend has been going on for a long time, its pace has significantly increased in the last hundred years due to the burning of fossil fuels. As the human population has increased, so has the volume of fossil fuels burned. Fossil fuels include coal, oil, and natural gas, and burning them causes what is known as the "greenhouse effect" in Earth's atmosphere.

The greenhouse effect is when the sun's rays penetrate the atmosphere, but when that heat is reflected off the surface cannot escape back into space. Gases produced by the burning of fossil fuels prevent the heat from leaving the atmosphere. These greenhouse gasses are carbon dioxide, chlorofluorocarbons, water vapor, methane, and nitrous oxide. The excess heat in the atmosphere has caused the average global temperature to rise overtime, otherwise known as global warming.

Global warming has presented another issue called climate change. Sometimes these phrases are used interchangeably, however, they are different. Climate change refers to changes in weather patterns and growing seasons around the world. It also refers to sea level rise caused by the expansion of warmer seas and melting ice sheets and glaciers. Global warming causes climate change, which poses a serious threat to life on Earth in the forms of widespread flooding and extreme weather. Scientists continue to study global warming and its impact on Earth.

Director

Tyson Brown, National Geographic Society

Author

National Geographic Society

Production Managers

Gina Borgia, National Geographic Society

Jeanna Sullivan, National Geographic Society

Program Specialists

Sarah Appleton, National Geographic Society, National Geographic Society

Margot Willis, National Geographic Society

Last Updated

October 19, 2023

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Earth is warming up, and humans are at least partially to blame. The causes, effects, and complexities of global warming are important to understand so that we can fight for the health of our planet.

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Climate Change: Vital Signs of the Planet

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Our Trajectory

Earth Will Continue to Warm and the Effects Will Be Profound

The potential future effects of global climate change include more frequent wildfires, longer periods of drought in some regions, and an increase in the wind intensity and rainfall from tropical cyclones. Credit: left - Mike McMillan/USFS, center - Tomas Castelazo / Wikimedia Commons / CC BY-SA 4.0, right - NASA.

Global climate change is not a future problem. Changes to Earth's climate driven by increased human emissions of heat-trapping greenhouse gases are already having widespread effects on the environment: glaciers and ice sheets are shrinking, river and lake ice is breaking up earlier, plant and animal geographic ranges are shifting, and plants and trees are blooming sooner.

Effects that scientists had long predicted would result from global climate change are now occurring, such as sea ice loss, accelerated sea level rise, and longer, more intense heat waves.

" The magnitude and rate of climate change and associated risks depend strongly on near-term mitigation and adaptation actions, and projected adverse impacts and related losses and damages escalate with every increment of global warming."

- Intergovernmental Panel on Climate Change

Some changes (such as droughts, wildfires, and extreme rainfall) are happening faster than scientists previously assessed. In fact, according to the Intergovernmental Panel on Climate Change (IPCC) - the United Nations body established to assess the science related to climate change - modern humans have never before seen the observed changes in our global climate, and some of these changes are irreversible over the next hundreds to thousands of years.

Scientists have high confidence that global temperatures will continue to rise for many decades, mainly due to greenhouse gases produced by human activities.

A Degree of Difference

So, the Earth's average temperature has increased about 2 degrees Fahrenheit during the 20th century. What's the big deal?

Read more

The IPCC's Sixth Assessment report, published in 2021, found that human emissions of heat-trapping gases have already warmed the climate by nearly 2 degrees Fahrenheit (1.1 degrees Celsius) since 1850-1900. The global average temperature is expected to reach or exceed 1.5 degrees C (about 3 degrees F) within the next few decades. These changes will affect all regions of Earth.

What's the difference between climate change and global warming?

"Global warming" refers to the long-term warming of the planet. "Climate change" encompasses global warming, but refers to the broader range of changes that are happening to our planet, including rising sea levels; shrinking mountain glaciers; accelerating ice melt in Greenland, Antarctica and the Arctic; and shifts in flower/plant blooming times.

detailed answer

The severity of effects caused by climate change will depend on the path of future human activities. More greenhouse gas emissions will lead to more climate extremes and widespread damaging effects across our planet. However, those future effects depend on the total amount of carbon dioxide we emit. So, if we can reduce emissions, we may avoid some of the worst effects.

" The scientific evidence is unequivocal: climate change is a threat to human wellbeing and the health of the planet. Any further delay in concerted global action will miss the brief, rapidly closing window to secure a liveable future." ²

- Intergovernmental Panel on Climate Change

Future Effects in the U.S.

U.S. Regional Effects

U.S. Regional Effects

Climate change is bringing different types of challenges to each region of the country. Some of the current and future impacts are summarized below. These findings are from the Third and Fourth National Climate Assessment Reports, released by the U.S. Global Change Research Program.

Is it too late to prevent climate change?

Humans have caused major climate changes to happen already, and we have set in motion more changes still. However, if we stopped emitting greenhouse gases today, the rise in global temperatures would begin to flatten within a few years. Temperatures would then plateau but remain well-elevated for many, many centuries.

detailed answer

Northeast. Heat waves, heavy downpours, and sea level rise pose increasing challenges to many aspects of life in the Northeast. Infrastructure, agriculture, fisheries, and ecosystems will be increasingly compromised. Farmers can explore new crop options, but these adaptations are not cost- or risk-free. Moreover, adaptive capacity, which varies throughout the region, could be overwhelmed by a changing climate. Many states and cities are beginning to incorporate climate change into their planning.

Northwest. Changes in the timing of peak flows in rivers and streams are reducing water supplies and worsening competing demands for water. Sea level rise, erosion, flooding, risks to infrastructure, and increasing ocean acidity pose major threats. Increasing wildfire incidence and severity, heat waves, insect outbreaks, and tree diseases are causing widespread forest die-off.

Southeast. Sea level rise poses widespread and continuing threats to the region's economy and environment. Extreme heat will affect health, energy, agriculture, and more. Decreased water availability will have economic and environmental impacts.

Midwest. Extreme heat, heavy downpours, and flooding will affect infrastructure, health, agriculture, forestry, transportation, air and water quality, and more. Climate change will also worsen a range of risks to the Great Lakes.

Southwest. Climate change has caused increased heat, drought, and insect outbreaks. In turn, these changes have made wildfires more numerous and severe. The warming climate has also caused a decline in water supplies, reduced agricultural yields, and triggered heat-related health impacts in cities. In coastal areas, flooding and erosion are additional concerns.

References
References
Header image shows cracked mud stretches across sections of the Panamint Valley. Credit: NPS/Kurt Moses; A degree of concern thermometer image credit: Pixabay/geralt

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intergovernmental panel on climate change

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Vital Signs of the Planet: Global Climate Change and Global Warming. Long-term effects of global climate change in the United States.

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Climate Change: Vital Signs of the Planet

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Home - Climate Change: Vital Signs of the Planet

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Vital Signs of the Planet: Global Climate Change and Global Warming. Current news and data streams about global warming and climate change from NASA.

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When it comes to finding solutions to protect the people and environment of the South, the Southern Environmental Law Center is leading the way. More than 30 years of legal expertise, community connections, and deep appreciation of our region's natural resources are what makes our organization ready to tackle our country's greatest environmental challenges, starting in our own backyard.

Across our region, our attorneys are at the forefront of the issues that matter.

Confronting climate change

Climate change is the defining environmental challenge of our time-one we cannot solve in our country without solving it in the South.

Recognizing that the South is central to any solution to climate change, we're working with Southern communities to adapt to rising seas and a changing climate, as well as making the transition towards clean renewable energy and cleaner transportation options. These efforts include removing barriers to solar power, advocating for better solutions to adapt to increased flooding, and pushing for greater energy efficiency across the region.

Listen to an overview of our latest podcast season, all about Southerners navigating sea level rise.

Fighting for environmental justice

We know that communities of color and people with limited financial means too often bear the brunt of pollution and that legal and policy action are tools for recourse. To that end, we're committed to addressing environmental injustices, promoting a more equitable future for the South, and upholding laws and policies that elevate the voices of impacted communities.

From opposing a water intake system from damaging sacred Monacan Indian Nation lands in Virginia to challenging a polluting waste recycling facility in Georgia that poses significant environmental and health risks to the thousands of Black neighbors living nearby, SELC is working to ensure a healthy environment for all.

Ensuring clean air and water

Okefenokee National Wildlife Refuge in Georgia.

Protecting the South's waters against pollution is a top priority because we believe that everyone has the basic right to clean water. That's why when the Trump administration eviscerated the Clean Water Act by proposing a major rollback-stripping protections that have been in place for decades and paving the way for the destruction of places like 400 acres of wetlands on the doorstep of the iconic Okefenokee Swamp, we stepped in.

We know that the South's historic dependence on fossil fuel s has burdened our communities with harmful air and water pollution for decades. As we pursue retiring coal plants across the South that negatively impact air quality, we're also overseeing the cleanup of more than 255 million tons of toxic coal ash that have put our waterways at risk.

Listen to the Real Housewives of Coal Ash to hear how two North Carolina women learned their neighbor, Duke Energy, had been storing toxic coal ash in their backyard for years and fought it all the way to the state house.

Protecting our natural treasures and biodiversity

We're working with national and local partners to oppose the significant weakening of the Endangered Species Act, which would impact the spectacularly biodiverse - and quickly developing - South in many ways. Our efforts to save wild red wolves from extinction are part of an ongoing federal lawsuit.

We have our work cut out for us in the weeks and months ahead. Please consider making a donation to help us do what we do best- identify, implement, and uphold long-lasting solutions.

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Solutions to climate change and environmental problems start in the South

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When it comes to finding solutions to protect the people and environment of the South, the Southern Environmental Law Center is leading the way. More than 30 years of legal expertise, community connections, and deep appreciation of our region's natural resources are what makes our organization ready to tackle our country's greatest environmental challenges, starting in our own backyard.

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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.

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There are many ways to prevent global warming from becoming worse. Many nations have put laws into place to fight climate change -- here's what you can do.

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What is Climate Change? Crash Course Geography #14

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Is It Too Late To Stop Climate Change? Well, it's Complicated.

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Earth's surface temperature has risen about 2 degrees Fahrenheit since the start of the NOAA record in 1880.

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Ten possibilities for staving off catastrophic climate change

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Our Climate Our Future | A climate education video experience

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Our Climate Our Future is an award-winning video experience that educates young people on the science of climate change and empowers them to take action.

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This page will help you understand the science behind climate change, the impacts of a changing climate, and how you can help slow climate change and prepare for it. We've also created a list of resources and activities for educators and students of all ages.

The Science

Science paints a clear picture: Climate change is happening; it is caused mostly by humans; and it creates many serious and damaging effects. The primary cause of climate change is human activities - like driving cars, creating electricity, and cutting down forests - not natural changes in the climate. These human activities release gases into the atmosphere called greenhouse gases, which slowly warm the planet, creating climate change.

The climate is very complex, and there are still some things we don't know about it. But through centuries of studies and experiments, we've been able to create a strong understanding of how the system works, and how humans are changing it.

The Greenhouse Effect

Imagine a greenhouse made of glass used to grow plants, like flowers and vegetables. The greenhouse keeps the plants inside warm even when it's cold outside because it traps heat from the sun. The earth's atmosphere acts like a greenhouse: When light from the sun passes through the atmosphere, some of it is absorbed by the Earth's surface to heat it, but some heat is also trapped in our atmosphere by certain gases. These heat-trapping gases are called greenhouse gases, and they act like a blanket, keeping the earth warm. This greenhouse effect is a natural process that makes the planet comfortable to live.

But human activities are increasing the amount of greenhouse gases in our atmosphere. One type of greenhouse gas, carbon dioxide, has reached a level in our atmosphere that the Earth hasn't seen for more than 400,000 years! Plants, soils, and the ocean can absorb carbon dioxide, but they can't keep up with all the extra greenhouse gases that we have been releasing. And some greenhouse gases stay in the atmosphere for a long time, from hundreds to even thousands of years. All these gases are making things hotter than natural, so we need to stop producing them to avoid climate change.

Weather vs. Climate

Weather refers to the state of the atmosphere in a short period of time, like minutes or days. It includes lots of things we are familiar with, like temperature, humidity, precipitation, and wind speeds. The weather changes every day, but the climate is much more consistent because it measures the patterns of weather over long periods of time (at least several decades). Let's say you were going to visit Florida for a few days in June. You would expect it to be hot and humid, because that's what the climate of Florida is usually like in June. It might turn out to be hot during your trip, or it could rain or be cloudy. All of those are examples of possible weather during those days.

The Greenhouse Effect Explained

Where do greenhouse gases come from?

Up until about 150 years ago, humans did not produce many greenhouse gases. That changed as the human population grew, we cut down forests to make way for cities and farms, and important inventions and technology, like in-home electricity and cars, transformed the way we live.

These inventions and technologies need energy. Some types of energy called fossil fuels - like coal, oil, and natural gas - have become important sources of that energy. Burning fossil fuels releases carbon dioxide and other greenhouse gases into the atmosphere. We call the release of these gases emissions.

Today in the United States, electricity and transportation (cars, trucks, and planes) are responsible for almost 60 percent of greenhouse gas emissions. The rest comes from agriculture, industry - such as factories that make products we use - and from energy we use in our homes and businesses.
Learn more about U.S. greenhouse gas emissions here.
Greenhouse Gases

The most common types of greenhouse gases are:

Carbon Dioxide (CO ₂): Carbon dioxide is the most common greenhouse gas created by human activities. It makes up 80 percent of U.S. greenhouse gas emissions. Most carbon dioxide enters the atmosphere when fossil fuels (oil, natural gas, and coal) are burned for electricity and transportation, and because of other processes like making cement. Carbon dioxide is removed from the atmosphere and stored when it is absorbed by plants, soils, animals, and the ocean as part of the carbon cycle.
Learn more about how energy emissions are controlled in the United States.

Methane (CH ₄): Methane is the next most common greenhouse gas emitted by human activities. It makes up 10 percent of U.S. greenhouse gas emissions. Most methane emissions come from raising livestock (like cows), but methane is also released when coal, natural gas, and oil are produced and transported, and when organic waste (like food) decays in landfills. Methane is a stronger gas than carbon dioxide, meaning it creates more warming, but it stays in the atmosphere for a shorter time.
Learn more about how industrial greenhouse gases like methane are controlled in the United States.

Nitrous Oxide (N ₂ O): Most nitrous oxide is emitted by agricultural activities, like applying fertilizer, but it also comes from industrial activities, burning fossil fuels, and other sources. It makes up 6 percent of U.S. greenhouse emissions. Nitrous oxide is even more powerful than methane and carbon dioxide at warming the atmosphere.

Hydrofluorocarbons (HFCs), Perfluorocarbons (PFCs), and Sulfur Hexafluoride (SF6): Try saying these gases three times fast! They're called "fluorinated gases" for short. These gases combined make up only 3 percent of all U.S. greenhouse gas emissions. That may sound small, but they are very important to solving climate change because they stay in the atmosphere for a very long time (sometimes for thousands of years!) and are much more powerful warmers than all other gases. These gases are made by humans and are used to cool our refrigerators, freezers, buildings and cars.

U.S. Greenhouse Gases by Gas Type and Sector, 2021

Impacts of a Changing Climate

Because of increases in greenhouse gas emissions, global temperatures are rising. Each of the past four decades has been warmer than the previous one. 2016 and 2020 were the warmest years on record, and the six warmest years have all been since 2010.
Learn more about the relationship between extreme weather and climate change.
The following charts show how emissions and temperatures have gone up since 1900, and how they could continue to change in the future. If we continue to emit more and more greenhouse gases, the temperature of the Earth will rise a lot - maybe as much as 5 degrees Celsius (9 degrees Fahrenheit) by 2100. Even if we reduce our emissions right now, the temperature of the Earth will still rise slightly, but we might be able to keep the rise below 2 degrees Celsius (or about 4.8 degrees Fahrenheit). Two degrees might not sound like much, but scientists agree that even that small amount of warming can have large impacts on humans and the environment.

Past and Projected Changes in Carbon Emissions and Temperature

Rising global temperatures affect many things, like extreme weather, human health, food supply, and ecosystems. These impacts are already being felt today, and groups like the poor, elderly, and others are especially vulnerable.
Impacts of climate change include:

Heat waves. Heat waves are long periods of time with temperatures that are hotter than normal. As the Earth warms, more areas will be at risk for hotter and more common extreme heat waves. Learn more about the link between climate change and extreme heat.

Heavy precipitation and storms. Heavy precipitation - like rain or snow - is becoming more common in many locations, which can lead to flooding and other dangerous weather. As seas warm, coastal storms like hurricanes are also becoming more frequent and damaging. Learn more about the link between climate change and heavy precipitation and hurricanes.

Sea level rise. Sea levels have risen about 8 inches since 1880 because glaciers and ice sheets are melting and seas are warming. Scientists predict that, with 1.5 degrees Celsius of warming, sea levels could rise by as much as 1.8 feet this century, which would harm communities living on islands and near coasts. These rises could be even higher if glaciers in Greenland or Antarctica melt very quickly.

Threats to habitats and animals. Warming temperatures, rising seas, melting ice, and other impacts of climate change can threaten the habitat of many plants and animals. Some species are moving to new habitats, but others may struggle to adapt and become endangered or extinct.

Ocean acidification. Extra carbon dioxide in the atmosphere is absorbed by the oceans, making them more acidic. This can make it difficult for corals and organisms that form shells to survive, which can create problems in the food chain for other sea animals.

Wildfires. These are fires that burn large amounts of forests and brush. When they are not controlled, wildfires can destroy homes and be deadly. The number of large wildfires and the length of the season when they're most likely and threatening have been increasing in recent years. Find out how climate change will worsen wildfire conditions.

Drought. A drought is a period with little rain and not enough water. Global warming will increase the risk of drought in some places and make it harder to grow food. Learn about the links between climate change and drought.

How can you help?

Even though climate change sounds scary, we still have time to avoid some of the worst impacts. Everyone can play a part, including government, businesses, and you.

There are two main things we need to do:

The first is to reduce the greenhouse gas emissions responsible for climate change. By choosing cleaner ways to power our homes, offices, and cars, and being more efficient and less wasteful, we can produce fewer greenhouse gas emissions.

There are lot of things you can do to help, like turning off the lights when you leave a room to reduce the electricity you use, walking or biking where you can, or planting trees to absorb carbon dioxide. If you do any of these things, make sure you communicate with other people (like your family, teachers, and friends) about why you're doing them! Communication can inspire more people to change their habits and help save the climate.

Look for more ideas on what we can do together and individually.

The second is to prepare for life in a changing climate. Even if we could stop creating greenhouse gases tomorrow, the climate would still change some because of our past emissions. So we need to make sure our buildings, roads, businesses, and communities are ready for the climate changes that we can't avoid. This includes things like helping cities on the coast prepare for floods, preventing wildfires in our forests, and more.

Learn how communities and companies are preparing.

The power of YOUth

Around the world, young people are learning about climate change and taking action. In fact, young people are some of the most important voices in the climate movement because you can inspire powerful people to create a better future for you.

You don't have to be a rocket scientist or a politician to make a difference in the fight against climate change. Whatever your talents are, there's a role for you to play. Some young people, like Greta Thunberg, Vanessa Nakate, and others, are leading the Fridays for Future movement to tell their governments to create strong policies to fight climate change. Other students are inventing new technologies to cut emissions and reduce waste. And others are using their creativity to bring awareness to climate change by writing music and creating art.

You can also look for ways to get involved in your community - maybe you can help your school set up a composting program to keep food waste out of the landfill. Maybe your synagogue or mosque needs help switching to energy efficient lights. Maybe you can write a letter to your local government to encourage your community to prepare for extreme weather or wildfires. Everyone can do something to fight climate change.

Check out our Educator Resources page for activities you can do to learn more about how climate change works and how you can be a part of the solution.
C2ES thanks the Alcoa Foundation for its support, which allowed us to develop our Climate Classroom content. As a fully independent organization, C2ES is solely responsible for its positions, programs, and publications.

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This page will help you understand the science behind climate change, the impacts of a changing climate, and how you can help slow climate change and prepare for it. We've also created a list of resources and activities for educators and students of all ages.

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IPCC — Intergovernmental Panel on Climate Change

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Why is climate change happening and what are the causes?

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There are many "natural" and "anthropogenic" (human-induced) factors that contribute to climate change. Climate change has always happened on Earth, which is clearly seen in the geological record; it is the rapid rate and the magnitude of climate change occurring now that is of great concern worldwide.

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The lowdown on the earth’s central environmental threat.

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On This Page:

Water resources are important to both society and ecosystems. We depend on a reliable, clean supply of drinking water to sustain our health. We also need water for agriculture, energy production, navigation, recreation, and manufacturing. Many of these uses put pressure on water resources, stresses that are likely to be exacerbated by climate change.

In many areas, climate change is likely to increase water demand while shrinking water supplies. This shifting balance would challenge water managers to simultaneously meet the needs of growing communities, sensitive ecosystems, farmers, ranchers, energy producers, and manufacturers.

In some areas, water shortages will be less of a problem than increases in runoff, flooding, or sea level rise. These effects can reduce the quality of water and can damage the infrastructure that we use to transport and deliver water.

Water Cycle and Water Demand

The water cycle (shown in the following figure) is a delicate balance of precipitation, evaporation, and all of the steps in between. Warmer temperatures increase the rate of evaporation of water into the atmosphere, in effect increasing the atmosphere's capacity to "hold" water. Increased evaporation may dry out some areas and fall as excess precipitation on other areas.

Changes in the amount of rain falling during storms provide evidence that the water cycle is already changing. Over the past 50 years, the amount of rain falling during very heavy precipitation events has increased for most of the United States. This trend has been greatest in the Northeast, Midwest, and upper Great Plains, where the amount of rain falling during the most intense 1% of storms has increased more than 30%. Warming winter temperatures cause more precipitation to fall as rain rather than snow. Furthermore, rising temperatures cause snow to begin melting earlier in the year. This alters the timing of streamflow in rivers that have their sources in mountainous areas.

As temperatures rise, people and animals need more water to maintain their health and thrive. Many important economic activities, like producing energy at power plants, raising livestock, and growing food crops, also require water. The amount of water available for these activities may be reduced as Earth warms and if competition for water resources increases.

Water Supply

Many areas of the United States, especially the West, currently face water shortages. The amount of water available in these areas is already limited, and demand will continue to rise as population grows. Many areas in the West have experienced less rain over the past 50 years, as well as increases in the severity and length of droughts; this has been especially of concern in the Southwest.

In the western part of the United States, less total annual rainfall, less snowpack in the mountains, and earlier snowmelt mean that less water will likely be available during the summer months when demand is highest. This will make it more difficult for water managers to satisfy water demands throughout the course of the year.

Water Quality

Water quality could suffer in areas experiencing increases in rainfall. For example, in the Northeast and Midwest increases in heavy precipitation events could cause problems for the water infrastructure, as sewer systems and water treatment plants are overwhelmed by the increased volumes of water. Heavy downpours can increase the amount of runoff into rivers and lakes, washing sediment, nutrients, pollutants, trash, animal waste, and other materials into water supplies, making them unusable, unsafe, or in need of water treatment. For information about how climate change and water quality affect public health, visit the Health Impacts & Adaptation page.

Freshwater resources along the coasts face risks from sea level rise. As the sea rises, saltwater moves into freshwater areas. This may force water managers to seek other sources of fresh water, or increase the need for desalination (or removal of salt from the water) for some coastal freshwater aquifers used as drinking water supply. In addition, as more freshwater is removed from rivers for human use, saltwater will move farther upstream. Drought can cause coastal water resources to become more saline as freshwater supplies from rivers are reduced. Water infrastructure in coastal cities, including sewer systems and wastewater treatment facilities, faces risks from rising sea levels and the damaging impacts of storm surges.

Impacts of Changes in Water Resources on Other Sectors

The impacts of climate change on water availability and water quality will affect many sectors, including energy production, infrastructure, human health, agriculture, and ecosystems. For more information on these impacts, please visit the following sectoral impacts pages:

References
[1] USGCRP (2014). Georgakakos, A., P. Fleming, M. Dettinger, C. Peters-Lidard, Terese (T.C.) Richmond, K. Reckhow, K. White, and D. Yates. Ch. 3: Water Resources. Climate Change Impacts in the United States: The Third National Climate Assessment, J. M. Melillo, Terese (T.C.) Richmond, and G. W. Yohe, Eds., U.S. Global Change Research Program, 69-112. [2] CCSP (2008). The Effects of Climate Change on Agriculture, Land Resources, Water Resources, and Biodiversity in the United States. A Report by the U.S. Climate Change Science Program and the Subcommittee on Global Change Research. Backlund, P., A. Janetos, D. Schimel, J. Hatfield, K. Boote, P. Fay, L. Hahn, C. Izaurralde, B.A. Kimball, T. Mader, J. Morgan, D. Ort, W. Polley, A. Thomson, D. Wolfe, M. Ryan, S. Archer, R. Birdsey, C. Dahm, L. Heath, J. Hicke, D. Hollinger, T. Huxman, G. Okin, R. Oren, J. Randerson, W. Schlesinger, D. Lettenmaier, D. Major, L. Poff, S. Running, L. Hansen, D. Inouye, B.P. Kelly, L Meyerson, B. Peterson, and R. Shaw. U.S. Environmental Protection Agency, Washington, DC, USA. [3] USGCRP (2014). Walsh, J., D. Wuebbles, K. Hayhoe, J. Kossin, K. Kunkel, G. Stephens, P. Thorne, R. Vose, M. Wehner, J. Willis, D. Anderson, S. Doney, R. Feely, P. Hennon, V. Kharin, T. Knutson, F. Landerer, T. Lenton, J. Kennedy, and R. Somerville. Ch. 2: Our Changing Climate. Climate Change Impacts in the United States: The Third National Climate Assessment, J. M. Melillo, Terese (T.C.) Richmond, and G. W. Yohe, Eds., U.S. Global Change Research Program, 19-67. [4] IPCC (2014). Jimenez, B.E., T. Oki, N.W. Arnell, G. Benito, J.G. Conley, P. Döll, T Jiang, and S.S. Mwakalila. Freshwater resources. In: Climate Change 2014: Impacts, Adaptation and Vulnerability. [5] CCSP (2009). Coastal Sensitivity to Sea-Level Rise: A Focus on the Mid-Atlantic Region. A Report by the U.S. Climate Change Science Program and the Subcommittee on Global Change Research. Titus, J.G. (Coordinating Lead Author), Anderson, K.E., Cahoon, D.R., Gesch, D.B., Gill, S.K., Gutierrez, B.T., Thieler, E.R., Williams, S.J. (Lead Authors). U.S. Environmental Protection Agency, Washington, DC, USA. [6] NRC (2008). Ecological Impacts of Climate Change. [7] CCSP (2008). Preliminary Review of Adaptation Options for Climate-Sensitive Ecosystems and Resources. A Report by the U.S. Climate Change Science Program and the Subcommittee on Global Change Research. Julius, S.H., J.M. West (eds.), J.S. Baron, B. Griffith, L.A. Joyce, P. Kareiva, B.D. Keller, M.A. Palmer, C.H. Peterson, and J.M. Scott (authors). U.S. Environmental Protection Agency, Washington, DC, USA. National Research Council. The National Academies Press, Washington, DC, USA. Contribution of Working Group II to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. Field, C.B., V.R. Barros, D.J. Dokken, K.J. Mach, M.D. Mastrandrea, T.E. Bilir, M. Chatterjee, K.L. Ebi, Y.O. Estrada, R.C. Genova, B. Girma, E.S. Kissel, A.N. Levy, S. MacCracken, P.R. Mastrandrea, and L.L.White (eds.) Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA.

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On This Page: Water resources are important to both society and ecosystems. We depend on a reliable, clean supply of drinking water to sustain our health. We also need water for agriculture, energy production, navigation, recreation, and manufacturing. Many of these uses put pressure on water resources, stresses that are likely to be exacerbated by climate change.

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Joshua Trees Are Being Wiped Out by Climate Change — Can They Be Saved?

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Earth's climate is changing at an rate. As a result, storms and are becoming more intense. Temperatures are rising. Polar ice caps are melting. This is causing oceans to rise. Low coastal areas are flooding. Animals are losing their habitats. Scientists are sounding the alarm: If we don't make changes to halt global warming, the planet's climate will become increasingly unbearable.

Climate, unlike weather, describes long-term patterns in the conditions of the . Earth's climate as a whole has changed several times throughout history. In the past 650,000 years alone, there have been seven cycles of glacial advance and retreat. Most of these changes are a natural part of Earth's 4.5 billion-year history. They are due to tiny variations in the Earth's orbit, which alter the amount of solar energy reaching the planet.

Scientists say that recent changes in Earth's climate are not due to natural causes. According to NASA, 97% of climate scientists agree there is a direct connection between human activity and the changes occurring on our planet.

TAYLOR WEIDMAN-BLOOMBERG/GETTY IMAGES

The Human Impact

Over the past 150 years, humans have used more and more engines, vehicles, and other machines. These devices burn through fossil fuels like coal and oil. Fossil fuels emit carbon dioxide, methane, and other greenhouse gases.

Normally, plants, trees, and the oceans absorb carbon dioxide and release it back into the atmosphere as oxygen. But an increase in fossil fuels has created more carbon dioxide than nature can take in. Adding to the problem are other human activities. Deforestation and the destruction of habitats also reduce the number of trees and plants. That makes it even harder to absorb all that carbon dioxide.

When too much carbon dioxide remains in the atmosphere, it causes problems for Earth's climate. Sunlight can pass through those gases. But the heat the sun generates cannot escape back out into space. So the gases end up trapping that heat. This then turns the planet into a giant greenhouse.

This greenhouse effect leads to changes in the climate, like increased temperatures. Average temperatures across the planet have not been increasing uniformly. But scientists observe a clear upward trend. Sixteen of the 17 warmest years ever recorded have occurred since 2001.

Scientists believe that climate change will have an impact far greater than milder winters and warmer summers. A warmer planet melts glaciers and other large bodies of ice faster than usual. Earth's glaciers help cool the planet. This means that as ice melts, temperatures will continue to rise. Rising sea levels, flooding, and stronger weather events will occur. And as the planet gets hotter, some places will become uninhabitable for people and animals.

These effects are already being felt around the world. Melting polar ice caps are causing huge chunks of ice to fall into the oceans. The melting ice is causing sea levels to rise about an eighth of an inch per year. That's according to the National Oceanic and Atmospheric Administration (NOAA). Many coastal areas are in danger of flooding. Some scientists predict that if sea levels continue to rise at current rates, entire cities may be submerged in the next 100 years.

In warm, dry regions, increased temperatures are causing severe drought. This leads to wildfires, food shortages, and water insecurity. Global warming has also led to coral bleaching of nearly two-thirds of Australia's Great Barrier Reef. The corals provide a habitat for nearly 1,500 different species of fish. This loss of sea life also affects the hundreds of millions of humans who rely on marine creatures for food.

Climate change is also creating more extreme weather events. This puts people and in danger. Scientists believe that global warming is responsible for hurricanes of greater intensity. Other results of global warming include more frequent and severe heat waves, droughts, blizzards, and rainstorms.

CHRIS SEWARD-RALEIGH NEWS & OBSERVER/TNS/GETTY IMAGES

Taking Action

Governments, companies, and individuals are working to cut greenhouse-gas emissions. Countries are joining to fight climate change and its effects. Innovators are working to create Earth-friendly fuels and power sources. And more and more people are using electric and hybrid vehicles. They are also turning to wind and solar power for alternative energy sources.

But humans still need to deal with the large amount of carbon dioxide already in the atmosphere. One solution being tested is called carbon sequestration. Through this process, carbon dioxide can be captured and stored underground before it goes into the atmosphere. Another proposal is to store carbon by planting more trees-nature's carbon trap.

Time will tell the true impact that climate change has on Earth. But how humans respond and adapt to a warming planet will set the course for years to come.

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Earth's climate is changing at an unprecedented rate. As a result, storms and droughts are becoming more intense. Temperatures are rising. Polar ice caps are melting. This is causing oceans to rise. Low coastal areas are flooding. Animals are losing...

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

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Definitive answers to the big questions.

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What is climate change? A really simple guide

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Human activities are causing world temperatures to rise, posing serious threats to people and nature.

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Climate Change: Vital Signs of the Planet

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Climate change is a long-term change in the average weather patterns that have come to define Earth's local, regional and global climates. These changes have a broad range of observed effects that are synonymous with the term.

Changes observed in Earth's climate since the mid-20th century are driven by human activities, particularly fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere, raising Earth's average surface temperature. Natural processes, which have been overwhelmed by human activities, can also contribute to climate change, including internal variability (e.g., cyclical ocean patterns like El Niño, La Niña and the Pacific Decadal Oscillation) and external forcings (e.g., volcanic activity, changes in the Sun's energy output, variations in Earth's orbit).

Scientists use observations from the ground, air, and space, along with computer models, to monitor and study past, present, and future climate change. Climate data records provide evidence of climate change key indicators, such as global land and ocean temperature increases; rising sea levels; ice loss at Earth's poles and in mountain glaciers; frequency and severity changes in extreme weather such as hurricanes, heatwaves, wildfires, droughts, floods, and precipitation; and cloud and vegetation cover changes.

"Climate change" and "global warming" are often used interchangeably but have distinct meanings. Similarly, the terms "weather" and "climate" are sometimes confused, though they refer to events with broadly different spatial- and timescales.

What Is Global Warming?

This graph illustrates the change in global surface temperature relative to 1951-1980 average temperatures, with the year 2020 statistically tying with 2016 for hottest on record (Source: NASA's Goddard Institute for Space Studies). Learn more about global surface temperature here. Credit: NASA/JPL-Caltech

Global warming is the long-term heating of Earth's surface observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere. This term is not interchangeable with the term "climate change."

Since the pre-industrial period, human activities are estimated to have increased Earth's global average temperature by about 1 degree Celsius (1.8 degrees Fahrenheit), a number that is currently increasing by more than 0.2 degrees Celsius (0.36 degrees Fahrenheit) per decade. The current warming trend is unequivocally the result of human activity since the 1950s and is proceeding at an unprecedented rate over millennia.

Weather vs. Climate

"If you don't like the weather in New England, just wait a few minutes."

Weather refers to atmospheric conditions that occur locally over short periods of time-from minutes to hours or days. Familiar examples include rain, snow, clouds, winds, floods, or thunderstorms.

Climate, on the other hand, refers to the long-term (usually at least 30 years) regional or even global average of temperature, humidity, and rainfall patterns over seasons, years, or decades.

Find Out More: A Guide to NASA's Global Climate Change Website

This website provides a high-level overview of some of the known causes, effects and indications of global climate change:

Evidence. Brief descriptions of some of the key scientific observations that our planet is undergoing abrupt climate change.

Causes. A concise discussion of the primary climate change causes on our planet.

Effects. A look at some of the likely future effects of climate change, including U.S. regional effects.

Vital Signs. Graphs and animated time series showing real-time climate change data, including atmospheric carbon dioxide, global temperature, sea ice extent, and ice sheet volume.

Earth Minute. This fun video series explains various Earth science topics, including some climate change topics.

Other NASA Resources

Goddard Scientific Visualization Studio. An extensive collection of animated climate change and Earth science visualizations.

Sea Level Change Portal. NASA's portal for an in-depth look at the science behind sea level change.

NASA's Earth Observatory. Satellite imagery, feature articles and scientific information about our home planet, with a focus on Earth's climate and environmental change.
Header image is of Apusiaajik Glacier, and was taken near Kulusuk, Greenland, on Aug. 26, 2018, during NASA's Oceans Melting Greenland (OMG) field operations. Learn more here. Credit: NASA/JPL-Caltech

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What is climate change? What is global warming? The terms are often used interchangeably but have distinct meanings. Similarly, the terms "weather" and "climate" are sometimes confused, though they refer to events with broadly different spatial- and timescales.

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The 28th Conference of the Parties (COP) taking place in Dubai from 30 November to 12 December 2023 will focus heavily on the first of the Global Stocktakes that were agreed upon in the Paris Agreement. In this infographic, we explain what the Global Stocktake is, how it works and the different interests and sticking points that are expected to shape the debate at COP28.

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Nature Climate Change is dedicated to publishing the most significant research across the physical and social sciences on the impacts of global climate change and its implications for the economy, policy and the world at large.

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Climate change is a long-term shift in global or regional climate patterns. Often climate change refers specifically to the rise in global temperatures from the mid-20th century to present.

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A: Since the Industrial Revolution, the global annual temperature has increased in total by a little more than 1 degree Celsius, or about 2 degrees Fahrenheit. Between 1880-the year that accurate recordkeeping began-and 1980, it rose on average by 0.07 degrees Celsius (0.13 degrees Fahrenheit) every 10 years. Since 1981, however, the rate of increase has more than doubled: For the last 40 years, we've seen the global annual temperature rise by 0.18 degrees Celsius, or 0.32 degrees Fahrenheit, per decade.

The result? A planet that has never been hotter. Nine of the 10 warmest years since 1880 have occurred since 2005-and the 5 warmest years on record have all occurred since 2015. Climate change deniers have argued that there has been a "pause" or a "slowdown" in rising global temperatures, but numerous studies, including a 2018 paper published in the journal Environmental Research Letters, have disproved this claim. The impacts of global warming are already harming people around the world.

What causes global warming?

A: Global warming occurs when carbon dioxide (CO ₂) and other air pollutants collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth's surface. Normally this radiation would escape into space, but these pollutants, which can last for years to centuries in the atmosphere, trap the heat and cause the planet to get hotter. These heat-trapping pollutants-specifically carbon dioxide, methane, nitrous oxide, water vapor, and synthetic fluorinated gases-are known as greenhouse gases, and their impact is called the greenhouse effect.

How is global warming linked to extreme weather?

A: Scientists agree that the earth's rising temperatures are fueling longer and hotter heat waves, more frequent droughts, heavier rainfall, and more powerful hurricanes.

In 2015, for example, scientists concluded that a lengthy drought in California-the state's worst water shortage in 1,200 years-had been intensified by 15 to 20 percent by global warming. They also said the odds of similar droughts happening in the future had roughly doubled over the past century. And in 2016, the National Academies of Science, Engineering, and Medicine announced that we can now confidently attribute some extreme weather events, like heat waves, droughts, and heavy precipitation, directly to climate change.

The impacts of global warming are being felt everywhere. Extreme heat waves have caused tens of thousands of deaths around the world in recent years. And in an alarming sign of events to come, Antarctica has lost nearly four trillion metric tons of ice since the 1990s. The rate of loss could speed up if we keep burning fossil fuels at our current pace, some experts say, causing sea levels to rise several meters in the next 50 to 150 years and wreaking havoc on coastal communities worldwide.

What are the other effects of global warming?

A: Each year scientists learn more about the consequences of global warming, and each year we also gain new evidence of its devastating impact on people and the planet. As the heat waves, droughts, and floods associated with climate change become more frequent and more intense, communities suffer and death tolls rise. If we're unable to reduce our emissions, scientists believe that climate change could lead to the deaths of more than 250,000 people around the globe every year and force 100 million people into poverty by 2030.

Global warming is already taking a toll on the United States. And if we aren't able to get a handle on our emissions, here's just a smattering of what we can look forward to:

Disappearing glaciers, early snowmelt, and severe droughts will cause more dramatic water shortages and continue to increase the risk of wildfires in the American West.

Rising sea levels will lead to even more coastal flooding on the Eastern Seaboard, especially in Florida, and in other areas such as the Gulf of Mexico.

Forests, farms, and cities will face troublesome new pests, heat waves, heavy downpours, and increased flooding. All of these can damage or destroy agriculture and fisheries.

Disruption of habitats such as coral reefs and alpine meadows could drive many plant and animal species to extinction.

Allergies, asthma, and infectious disease outbreaks will become more common due to increased growth of pollen-producing ragweed, higher levels of air pollution, and the spread of conditions favorable to pathogens and mosquitoes.

Though everyone is affected by climate change, not everyone is affected equally. Indigenous people, people of color, and the economically marginalized are typically hit the hardest. Inequities built into our housing, health care, and labor systems make these communities more vulnerable to the worst impacts of climate change-even though these same communities have done the least to contribute to it.

Where does the United States stand in terms of global-warming contributors?

A: In recent years, China has taken the lead in global-warming pollution, producing about 26 percent of all CO2 emissions. The United States comes in second. Despite making up just 4 percent of the world's population, our nation produces a sobering 13 percent of all global CO2 emissions-nearly as much as the European Union and India (third and fourth place) combined. And America is still number one, by far, in cumulative emissions over the past 150 years. As a top contributor to global warming, the United States has an obligation to help propel the world to a cleaner, safer, and more equitable future. Our responsibility matters to other countries, and it should matter to us, too.

Is the United States doing anything to prevent global warming?

A: We've started. But in order to avoid the worsening effects of climate change, we need to do a lot more-together with other countries-to reduce our dependence on fossil fuels and transition to clean energy sources.

Despite the lack of cooperation from the Trump administration, local and state governments made great strides during this period through efforts like the American Cities Climate Challenge and ongoing collaborations like the Regional Greenhouse Gas Initiative. Meanwhile, industry and business leaders have been working with the public sector, creating and adopting new clean-energy technologies and increasing energy efficiency in buildings, appliances, and industrial processes. Today the American automotive industry is finding new ways to produce cars and trucks that are more fuel efficient and is committing itself to putting more and more zero-emission electric vehicles on the road. Developers, cities, and community advocates are coming together to make sure that new affordable housing is built with efficiency in mind, reducing energy consumption and lowering electric and heating bills for residents. And renewable energy continues to surge as the costs associated with its production and distribution keep falling. In 2020 renewable energy sources such as wind and solar provided more electricity than coal for the very first time in U.S. history.

Is global warming too big a problem for me to help tackle?

A: No! While we can't win the fight without large-scale government action at the national level, we also can't do it without the help of individuals who are willing to use their voices, hold government and industry leaders to account, and make changes in their daily habits.

Wondering how you can be a part of the fight against global warming? Reduce your own carbon footprint by taking a few easy steps: Make conserving energy a part of your daily routine and your decisions as a consumer. When you shop for new appliances like refrigerators, washers, and dryers, look for products with the government's ENERGY STAR ® label; they meet a higher standard for energy efficiency than the minimum federal requirements. When you buy a car, look for one with the highest gas mileage and lowest emissions. You can also reduce your emissions by taking public transportation or carpooling when possible.

And while new federal and state standards are a step in the right direction, much more needs to be done. Voice your support of climate-friendly and climate change preparedness policies, and tell your representatives that equitably transitioning from dirty fossil fuels to clean power should be a top priority-because it's vital to building healthy, more secure communities.

You don't have to go it alone, either. Movements across the country are showing how climate action can build community, be led by those on the front lines of its impacts, and create a future that's equitable and just for all.

This story was originally published on March 11, 2016 and has been updated with new information and links.

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What is global warming? Global warming causes, effects, extreme weather, facts, and relation to climate change.