The world's climate is driven by energy from the sun. Solar energy comes to Earth from the sun. At the same time, heat escapes from Earth into space as infrared radiation. However, when infrared radiation tries to escape into space, these same gases absorb it, preventing it fro m leaving the earth and ultimately raising the planet's temperature. The effect is similar to a glass greenhouse, that is always warmer than the garden outside.
Greenhouse gases are naturally present in the planet's atmosphere.
In fact, life on earth depends on their ability to keep it warm. The problem now is that we are adding extra greenhouse gases to the atmosphere artificially, and so we can expect the glo bal climate to become warmer. Deforestation also releases substantial amounts of CO 2 . Most fossil fuel CO 2 emissions come from the fast-growing transpo rt and power sectors, and inefficient home heating and cooling. At home, that old refrigerator kept down in the basement chilling drinks also contributes to CO 2 emissions.