(September 7, 2017, 2:01 PM EDT) -- DENVER — A collection of environmental groups on Aug. 18 filed a brief in Colorado federal court contending that federal authorities violated requirements under the National Environmental Policy Act (NEPA) when they approved hydraulic fracturing leases on federal lands (Wilderness Workshop, et al. v. United States Bureau of Land Management, et al., No. 16-1822, D. Colo.)....