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U.S. methane emissions may be 50% more than EPA measure
http://www.usatoday.com/story/news/nation/2013/11/25/us-methane-emissions-study-epa/3699735/U.S. emissions of methane, a potent heat-trapping greenhouse gas, may be 50% higher than federal estimates, reports a team of Harvard and other researchers today.
Nationwide, emissions from cows and livestock operations may be twice as high as previously thought, and in the south-central region, those from fossil fuel extraction and refining may be almost five times higher than calculated by the U.S. Environmental Protection Agency, according to a study in the Proceedings of the National Academy of Sciences.
"It's really a very clear signal" of how much methane U.S. industry and other sources emit, says co-author Anna Michalak of the Carnegie Institution of Science's Department of Global Ecology. She says the study of the continental USA combines an unprecedented amount of data, taken by federal agencies from the tops of telecommunication towers, with newer statistical tools and meteorological models to calculate how much methane is actually in the atmosphere and where it probably came from.
Nationwide, emissions from cows and livestock operations may be twice as high as previously thought, and in the south-central region, those from fossil fuel extraction and refining may be almost five times higher than calculated by the U.S. Environmental Protection Agency, according to a study in the Proceedings of the National Academy of Sciences.
"It's really a very clear signal" of how much methane U.S. industry and other sources emit, says co-author Anna Michalak of the Carnegie Institution of Science's Department of Global Ecology. She says the study of the continental USA combines an unprecedented amount of data, taken by federal agencies from the tops of telecommunication towers, with newer statistical tools and meteorological models to calculate how much methane is actually in the atmosphere and where it probably came from.
So much for the claim US greenhouse gas emissions have been falling in recent years. That much methane released that fast more than wipes out the gains we've made in other sectors.