On Monday, the American Petroleum Institute and America's Natural Gas Alliance released a study finding that the U.S. Environmental Protection Agency's estimate that nearly 8.8 metric tons of methane escaped from each unconventional natural gas well in 2010 was twice as high as their estimate.
The report also disputes the EPA's statement that natural ags drilling was the No. 1 source of methane emissions in the United States.
The industry groups said that methane produced in the gut of cows and other ruminary animals and expelled into the air is No. 1.
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Chesapeake Energy Corp,the Oklahoma-based firm is the No. 1 driller in Ohio.
Rig Count Interactive Map by Baker Hughes, an energy services company.
Shale Sheet Fracking, a Youngstown Vindicator blog.
The Ohio Environmental Council, a statewide eco-group based in Columbus.
Earthjustice, a national eco-group.
People's Oil and Gas Collaborative-Ohio, a grass-roots group in Northeast Ohio.
Concerned Citizens of Medina County, a grass-roots group.
No Frack Ohio, a Columbus-based grass-roots group.
Fracking: Gas Drilling's Environmental Threat by ProPublica, an online journalism site.
Pipeline, blog from Pittsburgh Post-Gazette on Marcellus shale drilling.
Allegheny Front, environmental public radio for Western Pennsylvania.