Methane emissions during natural gas production fell 45.8 million tons annually from 1990 through 2010 because of the energy industry's tougher pollution controls, according to a report from the Environmental Protection Agency. This represents a 20% drop from the agency's earlier estimates. "The methane 'leak' claim just got a lot more difficult for opponents" of the fuel source, Steve Everley, team lead of Energy In Depth, said in response to the report.

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