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Methane Emissions from Natural Gas Systems

In this background Paper Prepared for the National Climate Assessment the experts come to the conclusion, that, while methane is only causing about 1/5 of the century-scale warming due to US emissions, it is responsible for nearly half the warming impact of current US emissions over the next 20 years. At this time scale, the methane emissions from natural gas systems contribute 17% of the entire GHG inventory of the U.S., for all gases from all sources. We repeat that these estimates may be low, and that the gradual replacement of conventional natural gas by shale gas is predicted to inrease these methane fluxes by 40% to 60% or more

Bibliography:
Robert Howarth, Drew Shindell, Renee Santoro, Anthony Ingraffea, Nathan Phillips, and Amy Townsend-Small
Methane Emissions from Natural Gas Systems
Background Paper Prepared for the National Climate Assessment, February 25, 2012

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