** FILE ** This March 25, 2014, file photo shows heat from machinery distorts the air as a worker watches over a hydraulic fracturing operation at an Encana Corp. gas well near Mead, Colo. (AP Photo/Brennan Linsley, File)
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** FILE ** This March 25, 2014, file photo shows heat from machinery distorts the air as a worker watches over a hydraulic fracturing operation at an Encana Corp. gas well near Mead, Colo. (AP Photo/Brennan Linsley, File)
