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CARBON INTENSITY
Here's a look at the “carbon intensity” of various fuels, measured in grams of carbon-dioxide equivalent per megajoule:
Electricity from coal 345
Electricity from natural gas 181
Reformulated gasoline from oil sands 108
Conventional reformulated gasoline 96.7
Natured corn ethanol 72.6
Compressed natural gas 73.1
Electricity from renewables 0
Woody biomass ethanol -1.7
(Does not include effects of indirect land use.)
Source: Northeast States Center for a Clean Air Future