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Carbon Dioxide, Methane, and Water absorb infrared light.

UV, and visible light come from the sun, warm the earth which then releases infrared light which is absorbed by carbon dioxide and other greenhouse gasses rather than letting it radiate back into space.

Methane is of minimal amounts in the atmosphere, but may be increased by feedlots and some of modern farming methods.

Water is in a balance, but possibly warming temperatures could cause an increase in the water carrying capacity of the air to increase humidity and and it's effect as a greenhouse gas.

Carbon Dioxide is a small constituent of our atmosphere, approximately 0.04%, but it has been measurably increasing since the industrial revolution, or from about 0.03% to 0.04%. While it does vary in natural cycles, it is believed that it is at a 400,000 year maximum.

See Wikipedia's article for more information:
http://en.wikipedia.org/wiki/Greenhouse_gas

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Q: What is it about the molecular structure of CO2 that makes it a greenhouse gas while other molecules in the atmosphere are not?
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