For GSS Climate Change chapter 3. Excerpt: Emissions of the greenhouse gas methane due to human activity were roughly 1.5 times greater in the United States in the middle of the last decade than prevailing estimates, according to a new analysis by 15 climate scientists published Monday in The Proceedings of the National Academy of Sciences. ...methane discharges in Texas and Oklahoma, where oil and gas production was concentrated at the time, were 2.7 times greater than conventional estimates. Emissions from oil and gas activity alone could be five times greater than the prevailing estimate.... Methane made up only about 9 percent of greenhouse gas emissions in 2011, the E.P.A. said; carbon dioxide is easily the most prevalent gas. But methane is much more potent. Even though it rapidly breaks down in the atmosphere, its contribution to global warming is 21 times greater than carbon dioxide’s over a 100-year period.... http://www.nytimes.com/2013/11/26/us/emissions-of-methane-in-us-exceed-estimates-study-finds.html. Michael Wines, The New York Times.
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