(December 2, 2016, 12:03 PM EST) -- CHEYENNE, Wyo. — Two states opposing the federal government’s final regulation on methane production during hydraulic fracturing operations on Nov. 28 filed a brief in Wyoming federal court, arguing that it should issue a preliminary injunction preventing implementation of the rule on grounds that it is “a blatant attempt by a land management agency to impose air quality regulations on existing oil and gas operations under the guise of waste prevention” (State of Wyoming, et al. v. United States Department of the Interior, et al., No. 16-285, D. Wyo.)....