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... through space to us, and it passes easily through our clear atmosphere. As the short wave radiation warms the earth's surface, it is then re-radiated back out from the earth's surface, but now in the form of long wave radiation. The long wave radiation is much less penetrating and therefore it cannot all leave the atmosphere. It is the greenhouse gases that keep the long wave radiation in our atmosphere. Because there are more and more greenhouse gases in the atmosphere, more long wave radiation is trapped which makes the Earth warmer. This is known as GLOBAL WARMING. What evidence is there that the earth's atmosphere is warming up? There is more than enough evidence to support the concept of global warming. Here are just a few events that have occurred largely because of global warming: * October 2000 - Storm and floods kill 6 and leave hundreds homeless in the ...