Shale gas and oil drilling pose environmental and public health risks, but the extent of those risks is unknown, the Government Accountability Office says in a new study. The GAO, an independent, nonpartisan agency that works for Congress, reviewed existing scientific reports on shale drilling and spoke to state regulators, industry experts and environmental groups. The GAO's report notes that regulators in Arkansas, Colorado, Louisiana, North Dakota, Ohio, Oklahoma and Texas as well as Pennsylvania have said state investigations found...
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