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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.
Rating Newest Oldest. Best Answer: Methane is a more potent greenhouse gas than carbon dioxide but itâs not the number one greenhouse gas. Of all the greenhouse gases itâs water vapour that causes the greatest amount of warming; for all intents and purposes this is entirely natural.