U of Texas prof Sharma says publicized methane contaminated water cases are natural, U of Alberta prof Muehlenbachs disagrees

RFF to study shale-gas development by Marty Niland, November 14, 2011, Energy Now!
University of Texas at Austin professor Mukul Sharma gave an overview, concluding that the benefits of development outweigh its risks. He dismissed concerns that the process causes large earthquakes, contaminates groundwater or leads to methane in home water supplies. Sharma attributed well publicized cases of natural gas infiltrating drinking water to natural “seeps” or vents between shale and the surface. However, University of Alberta Professor Karlis Muehlenbachs presented evidence that drilling activity can cause “seeps,” including documented cases of poor well construction allowing gas to migrate to the surface.

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