FuelCO2 Emissions Factor
Coal and lignite0.333
Coke oven gas0.338
Fuel oil0.267
Gas oil0.279
Mixed refinery gases0.246
Natural gas0.184
Unknown process gas0.246

Name Formula Lifetime
Radiative Efficiency
Global Warming
Potential *
Carbon dioxide CO2 variable 1.4x10-5 1
Methane CH412 3.7x10-4 21
Nitrous Oxide N2O 114 3.03x10-3 310
HFCs 134a=CH2FCF3 14 0.16 140-12,100
Sulphur Hexaflouride SF6 3200 0.52 22,800


* GWP, or Global Warming Potential allows scientists and policymakers to compare the ability of each greenhouse gas to trap heat in the atmosphere relative to other gases. GWP is the ratio of radiative forcing (both direct and indirect) from 1kg of greenhouse gas to 1kg of CO&sub2 over a period of 100 years (as recommended by the IPCC, the Intergovernmental Panel on Climate Change)


** Main figures are from the Third Assessment Report (TAR), figures in brackets are from the Second Assessment Report (SAR)