(February 27, 2018, 2:57 PM EST) -- RICHMOND, Va. — Environmental groups on Feb. 24 filed a brief in the Fourth Circuit U.S. Court of Appeals contending that the U.S. government breached federal law when it approved a pipeline slated to run through the Jefferson National Forest that would carry natural gas from hydraulic fracturing operations in the Marcellus and Utica Shale formations (Sierra Club Inc., et al. v. United States Forest Service, et al., No. 17-2399, 4th Cir.)....