Global Warming Potentials over a 100 Year Time Horizon (CO2 =1)        Greenhouse gas Formula GWP carbon dioxide CO2 1 methane CH4 21 nitrous oxide N2O 310 haloflurocarbons        HFC23 CHF3 11,700    HFC32 CH2F2 650    HFC43-10mee C4H2F10 1,300    HFC125 CH2F5 2,800    HFC134 CHF2CHF2 1,000    HFC134a CH2FCF3 1,300    HFC152a C2H4F2 140    HFC143 CHF2CH2F 300    HFC143a CF3CH3 3,800    HFC227ea C3HF7 2,900    HFC236fa C3H2F6 6,300    HFC245ca C3H3F5 560 chloroform CHCl3 4 methylene chloride CHCl2 9 perfluromethane CF4 6,500 perfluroethane C2F6 9,200 perflurocyclo-butane C-C4F8 8,700 perflurohexane C6F14 7,400 sulphur hexafluoride SF6 23,900 Home inquiries melb@aie.org.au