(June 2, 2017, 2:14 PM EDT) -- WASHINGTON, D.C. — The state of North Dakota on May 22 filed its opening brief in the District of Columbia Circuit U.S. Court of Appeals, arguing that a lower court’s denial of the state’s motion to intervene in a lawsuit brought by environmental advocacy groups against the U.S. Environmental Protection Agency related to the disposal of waste from hydraulic fracturing should be reversed because the state has Article III, U.S. Const. art. III, standing to intervene (Environmental Integrity Project, et al. v. Scott Pruitt, No. 17-5010, D.C. Cir.)....