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Any gas that absorbs and emits infrared radiation in the wavelength range emitted by earth is considered a GHG. Water vapor is the most abundant GHG in the earth's atmosphere. Regulated GHGs include carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and fluorinated gases [e.g. hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (Sulfr hexafluoride)].Get price

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