Per the U.S. Energy Information Administration web site, there are a number of chemical compounds found in the Earth's atmosphere that act as greenhouse gases. When sunlight strikes the Earth's surface, some of it is reflected back towards space as infrared radiation, or heat. Over time, the amount of energy sent from the sun to the Earth's surface should be about the same as the amount of energy radiated back into space, leaving the temperature of the Earth's surface roughly constant, but greenhouse gases absorb this infrared radiation and trap it in the atmosphere, causing conditions such as climactic change. Biofriendly Corporation's Green Plus View the rest of this article
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