Intergovernmental Panel on Climate Change) *待最後確認 溫室 氣體 GWP (1995) 1 GWP (2007)2 GWP (2014)3 GWP (2021)4* CO2 1 1 1 1 CH4 fossil origin 21 25 28 29.8 CH4 non fossil origin 27.2 N2 O 310 298 265 273 PFCs 4,668~10,350 7,390~12,200 6,630~11,100 0.004~12,400 HFCs 140~13,078 124~14,800 4~12,400 4~14,600 SF6 23,900 22,800 23,500 25200