(October 9, 2019, 1:13 PM EDT) -- DENVER — Environmental advocacy groups on Oct. 8 sued the U.S. Bureau of Land Management (BLM) and federal officials in Colorado federal court contending that they violated federal law when they approved a resource management plan (RMP) that opens more than 1 million acres for hydraulic fracturing in Colorado (Center for Biological Diversity, et al. v. United States Bureau of Land Management, et al., No. 19-2869, D. Colo.)....