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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.
You are here: GHGs. A greenhouse gas (often abbreviated as GHG) is a gas that both absorbs and emits radiation in the infrared range, commonly called thermal radiation or heat. When present in the atmosphere, these gases trap radiation in the form of heat, causing a warming process called the greenhouse effect.