For Earth's atmosphere consists of nitrogen, 78% oxygen, 21% argon 0.9% off the small amount of water vapor and carbon dioxide, oxygen, nitrogen and argon, although it is a major component of the atmosphere. But it did not affect global temperatures. In contrast, the gas molecules such as water vapor, carbon dioxide and methane, in the atmosphere, even though there is little ability to absorb infrared radiation and thus influence global temperatures warm. We call them the gas "Greenhouse gases" because of the ability to retain heat, if no greenhouse gases already. Earth's surface temperature is only -18 ° C, which means that all water on the planet would freeze.
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