Greenhouse gases definition
(GHGs) Group of gases which individually act to trap solar energy near the earth. GHGs for which emission levels have been estimated are carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), sulphur hexafluoride (SF6), carbon tetrafluoride (CF4), carbon hexafluoride (C2F6) and hydrofluorocarbons (HFCs).