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Greenhouse gases (GHG): For the purposes of the GHG Protocol, GHGs are the seven gases covered by the UNFCCC: carbon dioxide (C02); methane (CH4); nitrous oxide (N20); hydrofluorocarbons (HFCs); perfluorocarbons (PFCs); sulphur hexafluoride (SF6), and nitrogen trifluoride (NF3).