Warming Potentials of Halocarbons and Greenhouses Gases

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Table 1. Estimated 1994 Sales and Emissions of CFCs and Other Greenhouse Gases
(Thousand Metric Tons)
Compound Chemical
Formula
100-Year
Global
Warming
Potential
(CO2< "/sub">=1)
1994
U.S.
Sales
1994
TRI
Emissions
1994
U.S.
Emissions
Principal Uses
Chlorofluorocarbons (CFCs)
Trichlorofluoromethane (CFC-11) CFCl3 1,320 7.3 1.4 37.0 Blowing agent, chillers
Dichlorodifluoromethane (CFC-12) CF2Cl2 6,650 40.0 2.2 71.0 Auto air conditioners, chillers, blowing agent
Freon 113 (CFC-113) C2F3Cl3 9,300 NA 2.3 17.0 Solvent
CFC-114 C2F4Cl2 9,300 NA 0.6 5.0 Solvent
CFC-115 C2F5Cl 9,300 NA 0.1 3.0 Solvent, refrigerant
Hydrochlorofluorocarbons
Chlorodifluoromethane (HCFC-22) CF2HCl 1,350 97.3 3.6 91.2 Residential air conditioners
HCFC-123 C2F3HCl2 93 NA 2.4 2.0 Refrigerant
HCFC-124 C2F4HCl 480 NA 0.4 2.0 Sterilant
HCFC-141b C2H3FCl2 270 NA 3.5 16.0 CFC replacement
Chlorodifluoroethane (HCFC-142b) C2H3F2Cl 1,650 NA 2.6 10.0 CFC replacement
Bromofluorocarbons (Halons)
Halon-1211 CClF2Br NA NA -- 1.0 Fire extinguisher
Halon-1301 CF3Br -31,400 a<4 -- 2.0 Fire extinguisher
Hydrofluorocarbons (HFCs)
HFC-23 CHF3 11,700 NA NA 4.2 HCFC byproduct
HFC-125 C2HF5 2,800 NA NA 1.1 CFC/HCFC replacement
HFC-134a CH2FCF3 1,300 a26 NA 10.4 Air conditioners, refrigeration
HFC-152a C2H4F2 140 NA NA 1.5 Aerosol propellant
HFC-227ea C3HF7 2,900 NA NA 0.9 CFC replacement
Perfluorocarbons (PFCs)
Perfluoromethane CF4 6,900 a<1 NA 2.0 Byproduct
Perfluoroethane C2F6 9,200 NA NA 0.2 Byproduct, solvent
Other Chemicals
Carbon Tetrachloride CCl4 -1,550 39.9 0.3 16.0 CFC feedstock, solvents
Methyl Chloroform C2Cl3H3 -700 166.1 17.3 78.0 Solvent
Methylene Chloride CH2Cl2 9 119.4 28.9 28.9 Solvent
Chloroform CHCl3 5 217.5 5.2 5.2 HCFC feedstock
Sulfur Hexafluoride SF6 23,900 6.0 NA 1.0 Insulator, cover gas
aEIA estimate.
NA = not available. -- = less than 500 metric tons.
Sources: Chemical formulae and global warming potentials from Intergovernmental Panel on Climate Change, Climate Change 1995: The Science of Climate Change (Cambridge, UK: Cambridge University Press, 1996), pp. 119 and 121. Production and sales of CFCs and other chemicals from International Trade Commission, Synthetic Organic Chemicals: United States Production and Sales, 1994 (Washington, DC, 1995). TRI emissions from U.S. Environmental Protection Agency, 1994 Toxics Release Inventory: Public Data Release, EPA-745-R-94-001 (Washington, DC, June 1996), p. 73. Estimated 1994 U.S. emissions from U.S. Environmental Protection Agency, Inventory of U.S. Greenhouse Gas Emissions and Sinks, 1990-1994, EPA-230-R-96-006 (Washington, DC, November 1995), pp. 37-40.

 

Table 2. Estimated U.S. Emissions of Halocarbons and Miscellaneous Greenhouse Gases, 1988-1995
(Thousand Metric Tons of Gas)
Gas 1988 1989 1990 1991 1992 1993 1994 P1995
Chlorofluorocarbons (CFCs)
CFC-11 85 80 60 54 48 39 37 8
CFC-12 110 114 112 108 102 99 71 66
CFC-113 83 78 50 39 28 20 17 6
Other CFCs NA NA 9 9 9 8 8 7
Halons NA NA 3 3 3 3 3 2
Hydrochlorofluorocarbons (HCFCs)
HCFC-22 74 76 82 82 86 89 91 91
HCFC-141b 0 0 0 1 3 8 16 21
HCFC-142b 0 0 0 3 3 6 10 16
Other HCFCs NA NA 2 3 3 4 4 8
Hydrofluorocarbons (HFCs)
HFC-23 5 5 4 4 4 4 4 4
HFC-134a NA NA 1 1 3 6 10 16
HFC-152a NA NA NA NA 1 1 2 3
Other HFCs NA NA NA NA NA NA 2 2
Perfluorocarbons (PFCs) 3 3 3 3 3 2 2 2
Other Chemicals
Carbon Tetrachloride NA NA 30 NA 26 22 16 NA
Methyl Chloroform 323 296 316 224 215 122 78 32
Sulfur Hexafluoride NA NA 1 1 1 1 1 1
P = preliminary data. NA = not available.
Sources: 1990 and 1994 emissions estimates from U.S. Environmental Protection Agency

File last modified: 2/9/00

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