In a file photo from July 18, 2013, photo a plume of gas burns while work progresses at a tracking site run by Encana Corporation in an area near Kalkaska, Mich. Researchers have wrapped up a three-year study of how Michigan regulators could improve oversight of the oil and natural gas development process known as hydraulic fracturing, or fracking. The University of Michigan released the final version of its analysis Wednesday, Sept. 23, 2015. Study leader John Callewaert says hundreds of wording revisions were made in response to feedback after a draft was issued in February. (Dale Young/Detroit News via AP, File) DETROIT FREE PRESS OUT; HUFFINGTON POST OUT — FILE
Featured Photo Galleries
