Recent technological advances have greatly increased our recoverable natural gas reserves. A great opportunity is opening for reduction of greenhouse gasses from electricity generation (pipeline natural gas releases only 57 percent as much CO2 as coal). The situation is quite different different for CNG (compressed natural gas) when used as a transportation fuel. CO2 releases are tabulated by The EIA (Energy Information Administration) as part of the 'Voluntary Reporting of Greenhouse Gasses Program'. I have used Gasohol (gasoline with 10% ethanol) as the standard because it is the most common fuel, even if not so stated on the pump.
Percentage of CO2 release compared to Gasohol
Gasoline = 107%
E85 (gasoline with 85% ethanol, called Flexfuel) = 22%
CNG = 80%
Propane (a natural gas by-product) = 95%
note: EIA gives ethanol 100% credit for the CO2 absorbed during plant growth.
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