| http://www.w3.org/ns/prov#value | - The hydraulic fracturing of shale formations to develop natural gas has no direct connection to groundwater contamination, according to a study released Feb. 16 by the Energy Institute at the University of Texas at Austin.The study reported that many problems blamed on hydraulic fracturing are related to processes common to all oil and gas drilling operations, such as casing failures or poor cemen
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