The greenhouse effect is how Earth stays warm enough for life. It works like a blanket around our planet. The sun's heat comes to Earth and warms it up. Some of this heat tries to escape back into space. But gases in the air, called greenhouse gases, trap some of the heat. This keeps Earth warm, just like a greenhouse keeps plants warm. Without the greenhouse effect, Earth would be too cold for us to live. But too many greenhouse gases can make Earth too warm.
1. What does the greenhouse effect do for Earth?
2. What is compared to a blanket around Earth?
3. What traps heat in the greenhouse effect?
4. What could happen if there are too many greenhouse gases?