Greenhouse gases reflect infrared radiation, so some of the heat leaving the Earth bounces off the greenhouse gases in our atmosphere and comes back to the Earth’s surface. But when that same energy leaves the Earth, it does so as infrared radiation, which we experience as heat. ![]() When energy from the sun first reaches us, it does so mainly as light. The reason they warm the Earth has to do with the way energy enters and leaves our atmosphere. ![]() Greenhouse gases are gases-like carbon dioxide (CO 2), methane, and nitrous oxide-that keep the Earth warmer than it would be without them.
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