Arch Coal, operators of the West Elk mine in Somerset, may fight a federal judge’s ruling that blocks an expansion because government land managers failed to consider the impact on climate change. U.S. District Court Judge Brooke Jackson’s ruling deems federal and state agencies’ decisions on environmental impact flawed — holding up work that was set to begin this month. The court ruling Friday adds to the body of law requiring government land managers to factor in climate change before approving projects. The Post reports expansion into a 1,700-acre area cannot begin until the federal Bureau of Land Management and U.S. Forest Service conduct a full analysis of the environmental impact. WildEarth Guardians, the Sierra Club and High Country Conservation Advocates launched a legal challenge of government decisions to allow the coal mine expansion.