The greenhouse effect is the way Earth's atmosphere traps heat from the sun, keeping our planet warm enough for life. Without it, Earth would be a frozen ball of ice, about 60 degrees Fahrenheit colder than it is now.

Here's how it works: Sunlight passes through our atmosphere and warms the Earth's surface. The warm surface then releases heat back toward space, but certain gases in our atmosphere, called greenhouse gases, catch some of that escaping heat and hold it close to Earth, like a blanket. The most important greenhouse gases are carbon dioxide, water vapor, and methane.

The name comes from how actual greenhouses work. A greenhouse is a building made mostly of glass where gardeners grow plants. Sunlight passes through the glass and warms everything inside, but the glass helps trap heat so it can't escape as easily. The plants stay cozy even on cold days.

Scientists have discovered that when we burn coal, oil, and gasoline, we release extra carbon dioxide into the atmosphere. This strengthens the greenhouse effect, causing Earth's average temperature to rise. While the natural greenhouse effect keeps us alive, too much of it creates problems like melting ice caps, changing weather patterns, and rising sea levels. Understanding the greenhouse effect helps scientists figure out how Earth's climate works and how human activities affect it.