| GHG | Lifetime [years] | GWP-20 | GWP-100 | Main emitters |
|---|---|---|---|---|
CO2 | 200-2000; 20ā35% remain (almost) forever | 1 | 1 | Energy production, transportation, construction, fire & geological activities [28], [29] |
Methane (CH4) | 9.1 | 72 | 25 | Methane production & associated leakage, agriculture, waste [10] |
Nitrous oxide (N2O) | 131 | 289 | 298 | Agriculture, waste, stationary combustion, chemical production [10] |
CFC-11 (CCl3F) | 45 | 6,730 | 4,750 | Aerosol sprays, refrigerants, industrial uses - banned by Montreal Protocol [666] |
PFC-14 (CF4) | 50000 | 5,210 | 7,390 | Aerosol sprays, refrigerants, industrial uses - talks of banning in EU [25] |
HFC-134a (CH2FCF3) | 13.4 | 3,830 | 1,430 | Aerosol sprays, refrigerants, industrial uses - currently in phase-down [26] |