An unidentified worker steps through the maze of hoses being …

AP FILE PHOTO, APRIL 15, 2009 | published: February 4, 2013

An unidentified worker steps through the maze of hoses being used at a remote fracking site being run by Halliburton for natural-gas producer Williams in Rulison, Colo. The oil and gas industry is trying to ease environmental concerns by developing nontoxic fluids for the drilling process known as fracking.