The Kyoto Protocol addresses emissions of the six greenhouse gases below.
Greenhouse Gases
Carbon dioxide (CO2)
1
Methane (CH4)
23
Nitrous oxide (N2O)
296
Hydrofluorocarbons (HFCs)
12 - 12,000
Perfluorocarbons (PFCs)
5,700 – 11,900
Sulphur hexafluoride (SF6)
22,200
Data source: Third Assessment IPCC report, 2001
Earlier IPCC reports present different figures for GWP.