When the Environmental Protection Agency abruptly retreated on its multimillion-dollar investigation into water contamination in a central Wyoming natural gas field last month, it shocked environmentalists and energy industry supporters alike.
In 2011, the agency had issued a blockbuster draft report saying that the controversial practice of fracking was to blame for the pollution of an aquifer deep below the town of Pavillion, Wy. 2013 the first time such a claim had been based on a scientific analysis.