Global Warming Potentials (Mass Basis), Referenced to the Absolute GWP for the Adopted Carbon Cycle Model CO 2 Decay Response and Future CO 2 Atmospheric Concentrations Held Constant at Current Levels. (Only Direct Effects Are Considered.)

Species (chemical) Chemical formula Global warming potential (time horizon) 20 years 100 years 500 years CFC-11 CFCl 3 5000 4000 1400 CFC-12 CF 2 Cl 2 7900 8500 4200 CFC-13 CClF 3 8100 11700 13600 CFC-113 C 2 F 3 Cl 3 5000 5000 2300 CFC-114 C 2 F 4 Cl 2 6900 9300 8300 CFC-115 C 2 F 5 Cl 6200 9300 13000 H-1301 CF 3 Br 6200 5600 2200 Carbon Tet CCl 4 2000 1400 500 Methyl Chl CH 3 CCl 3 360 110 35 HCFC-22 CF 2 HCl 4300 1700 520 HCFC-141b C 2 FH 3 Cl 2 1800 630 200 HCFC-142b C 2 F 2 H 3 Cl 4200 2000 630 HCFC-123 C 2 F 3 HCl 2 300 93 29 HCFC-124 C 2 F 4 HCl 1500 480 150 HCFC-225ca C 3 F 5 HCl 2 550 170 52 HCFC-225cb C 3 F 5 HCl 2 1700 530 170 AUnited Nations Environment Programme (UNEP), February 1995, Scientific Assessment of Ozone Depletion: 1994, Chapter 13, “Ozone Depleting Potentials, Global Warming Potentials and Future Chlorine/Bromine Loading,” and do not reflect review of scientific documents published after that date. [61 FR 1285, Jan. 19, 1996]