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Greenhouse gas

Greenhouse gas

A greenhouse gas absorbs and radiates heat in the lower atmosphere that otherwise would be lost in space. The greenhouse effect is essential for life on this planet, since it keeps average global temperatures high enough to support plant and animal growth. The main greenhouse gases are carbon dioxide (CO2), methane (CH4), chlorofluorocarbons (CFCs) and nitrous oxide (N20). By far the most abundant greenhouse gas is CO2, accounting for 70 percent of total greenhouse gas emissions