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Absorbs Earth's radiation, produced by humans and nonhumans (dino gas may have warmed globe), include CO2 and H2O vapor, H2O vapor is most powerful absorber of radiation emitted by Earth.
Methane (CH 4) is an extremely effective absorber of radiation, though its atmospheric concentration is less than CO2 and its lifetime in the atmosphere is brief (10-12 years), compared to some other greenhouse gases (such as CO 2, N 2 O, CFCs). Methane has both natural and anthropogenic sources.