U.S. Methane Emissions Higher Than Estimated | Chemical & Engineering News
Volume 91 Issue 48 | p. 29 | Concentrates
Issue Date: December 2, 2013

U.S. Methane Emissions Higher Than Estimated

Livestock and fossil-fuel extraction are primary sources of error
Department: Science & Technology
Keywords: methane, greenhouse gas, global warming, EPA, emissions

Estimates of how much methane is emitted to the atmosphere from the U.S. are too low, according to a new analysis of what’s actually in the air (Proc. Natl. Acad. Sci. USA 2013, DOI: 10.1073/pnas.1314392110). Emissions inventories by agencies such as EPA are done with a “bottom up” approach that calculates emissions based on estimates of the amount of methane typically released from sources such as livestock and natural gas extraction. In the new work, a team led by Scot M. Miller and Steven C. Wofsy of Harvard University analyzed methane measurements made at ground level, on towers, and from aircraft in various locations across the U.S. in 2007 and 2008. They then used air transport models to track back from the measurement location to emission points. They found that methane emissions are generally 50% higher than EPA estimates, with livestock across the entire U.S. and fossil-fuel extraction in the South Central region as primary targets of underestimation.

 
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Comments
George Krepinsky (April 9, 2018 11:22 PM)
Would it be a good reason for humans becoming vegetarians? Such scenario would require lots of land, water, and fertilizers, of course.

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