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greenhouse gases

Those gaseous constituents of the atmosphere both natural anthropogenic, that absorb and re-emit infrared radiation. The major GHGs are carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). Less prevalent – but very powerful – greenhouse gases are hydrofluorocarbons (HFCs), perfluorocarbons (PFCs) and sulphur hexafluoride (SF6).