40 CFR Appendix I to Subpart A of Part 82: Appendix I to Subpart A of Part 82—Global Warming Potentials (Mass Basis), Referenced to the Absolute GWP for the Adopted Carbon Cycle Model CO2 Decay Response and Future CO2 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 CFCl3 5000 4000 1400

CFC-12 CF2 Cl2 7900 8500 4200

CFC-13 CClF3 8100 11700 13600

CFC-113 C2 F3 Cl3 5000 5000 2300

CFC-114 C2 F4 Cl2 6900 9300 8300

CFC-115 C2 F5 Cl 6200 9300 13000

H-1301 CF3 Br 6200 5600 2200

Carbon Tet CCl4 2000 1400 500

Methyl Chl CH3 CCl3 360 110 35

HCFC-22 CF2 HCl 4300 1700 520

HCFC-141b C2 FH3 Cl2 1800 630 200

HCFC-142b C2 F2 H3 Cl 4200 2000 630

HCFC-123 C2 F3 HCl2 300 93 29

HCFC-124 C2 F4 HCl 1500 480 150

HCFC-225ca C3 F5 HCl2 550 170 52

HCFC-225cb C3 F5 HCl2 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.