Global Warming Facts For Kids

Global warming and climate change describe how Earth’s air, oceans, and weather are changing today. Global warming means the planet’s average surface temperature is getting warmer. Climate change is the wider set of changes that happen because of that warming, like different rainfall, melting ice, and higher seas. Both words are about the same big idea, but climate change points to the many effects that come from a warmer world.

People are the main cause of the recent warming. Since machines and factories grew after about 1800, burning coal, oil, and gas along with cutting forests has put extra heat-trapping gases into the air. Today the atmosphere has about 50% more carbon dioxide than before this time, at levels not seen for millions of years.

Scientists and news reports use a few important words to talk about this topic. Global warming means the rise in Earth’s average temperature. Climate change is the name for that warming plus the changes it causes in weather, sea level, and ice. People sometimes say “global heating,” “climate crisis,” or “climate emergency” to show it’s serious.

These words became common in the late 1900s. At first, scientists were sorting out how tiny, dirty particles in the air could cool parts of the world while greenhouse gases warmed it. Today we know the warming from greenhouse gases is the larger effect.

Scientists measure how much warmer Earth is compared with the late 1800s. In recent years the planet has been the warmest on record. For example, 2024 was about 1.6 °C warmer than the mid-1800s average. That extra heat is already changing weather and ice.

Experts use different future paths to make guesses about how hot it could get. If humans very quickly cut emissions, warming by 2100 might be about 1.0–1.8 °C. With medium emissions it could be 2.1–3.5 °C, and with very high emissions 3.3–5.7 °C. More emissions mean more warming, and in some paths the planet keeps getting warmer after 2100.

The main reason Earth is warming is extra greenhouse gases in the air. Think of these gases like a blanket: sunlight warms the ground, and greenhouse gases let sunlight in but slow some of the heat from leaving back to space. That makes the lower atmosphere and surface warmer.

Not all greenhouse parts behave the same. Water vapor and clouds provide much of the natural “blanket” and change with temperature. Other gases added by people — like carbon dioxide, methane, and nitrous oxide — are the big drivers that push the whole climate toward more warming. Burning fossil fuels, cutting forests, and some farming put these gases into the air. Carbon dioxide stays a long time, so cutting its emissions is important to slow future warming.

People change the land when they cut down trees, grow crops, or build towns and roads. One big change is deforestation — when forests are cut down. Trees store carbon, so when they are removed they release that carbon into the air and stop acting as a carbon sink (a place that keeps carbon out of the air). About a third of Earth’s land is used for farming and grazing, while about a quarter is forest. Because forests hold a lot of carbon, removing them is a major reason the world is getting warmer.

When forests are cleared, two main things happen: more carbon goes into the air, and the land’s surface changes. From 2001 to 2018, parts of tree loss were cut for farming, some were cleared temporarily for shifting farms, some were logged, and some were lost to wildfires. These actions add carbon to the atmosphere and reduce places that absorb it.

Local plants also change how land reflects and releases heat. Scientists call reflectiveness albedo. Replacing dark forests with lighter grass can reflect more sun and sometimes cool a small area, while healthy forests often help cool places by releasing water into the air.

Climate change changes the homes of many animals and plants. The oceans and ice are warming and melting, and weather patterns are shifting. Since the 1950s, droughts and heat waves have happened more often. In parts of Asia, monsoon rains have changed, and northern monsoons have grown stronger since around 1980.

Sea level is rising because warm water expands and ice on land melts. In the Arctic, Arctic sea ice is getting thinner and smaller, and summers with much less ice may happen more often if the world warms a lot. Some species must move or face big challenges.

People feel these changes in many ways. Plants and animals move toward the poles or up mountains to find cooler places; for example, some North American birds have shifted about 1.5 km north each year on average over several decades. Higher carbon dioxide and longer warm seasons have helped grow more plants in some areas, called greening, but heatwaves and droughts can lower farm yields in other places.

Other effects include more dry land and spreading deserts, and trees and shrubs growing into new areas (called woody plant encroachment) on up to hundreds of millions of hectares. Ocean life is also moving toward the poles, and warmer seas can cause more frequent marine heatwaves that harm sea creatures.

Renewable energy comes from sources that do not run out quickly, like sunlight, wind, flowing water, and heat from inside the Earth. For a long time, most of the world's energy—about four out of five parts—came from burning coal, oil, or gas. Now, many places are building more clean power instead. Solar panels and wind turbines often make electricity more cheaply than other new power plants, so they are being added a lot.

Another idea is carbon capture, which means taking extra carbon dioxide out of the air or from factory smoke and storing it safely. It is like using a big sponge to catch some of the pollution. Capturing can help, but the easiest and best step is to use less polluting energy in the first place.

To live well when the climate changes, people make changes called adaptation. One big step is improving energy efficiency—using less energy to do the same jobs. That helps because it makes it easier to use clean energy and keeps the power system calm and steady.

Examples are switching to electric cars or riding bikes, fixing factories with better heaters and motors, and making houses warmer with insulation or new windows. Heat pumps are devices that can warm or cool homes more efficiently. These changes save money over time and make towns and farms safer when weather turns unusual.