Global warming is the unnatural increase in the average global temperatures caused by the release of greenhouse gases.
What is a greenhouse gas?
A greenhouse gas is a gas that when released into the atmosphere traps heat radiated by the Earth and prevents the Earth from releasing the heat into space. It is good that all heat is not released into space so we can stay warm. However, by releasing greenhouse gases an excess of heat is captured by the Earth causing the Earth to begin to overheat.
Why are they called greenhouse gases?
These gases are called “greenhouse gases” because they function like a greenhouse used to grow plants. A greenhouse traps heat to keep temperatures warm inside so plants are at the perfect temperature to grow.