Emissions

FuelCO2 Emissions Factor
(kgCO2/kWhth)
Coal and lignite0.333
Coke oven gas0.338
Ethane0.191
Fuel oil0.267
Gas oil0.279
Hydrogen-
Methane0.184
Mixed refinery gases0.246
Natural gas0.184
Unknown process gas0.246

Name Formula Lifetime
(years)
Radiative Efficiency
(Wm-2ppb-1>)
Global Warming
Potential *
Carbon dioxide CO2 variable 1.4x10-5 1
Methane CH412 3.7x10-4 21(23)**
Nitrous Oxide N2O 114 3.03x10-3 310(296)
HFCs 134a=CH2FCF3 14 0.16 140-12,100 (120-12,000)
Sulphur Hexaflouride SF6 3200 0.52 22,800(22,200)

* 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)