A federal judge in Denver is considering a lawsuit to stop the expansion of coal mining in northwestern Colorado.
Wildlife advocates have sued the federal government after it declined to designate some areas in the West as critical habitat for the imperiled Canada lynx.
Federal officials granted protection to the Gunnison sage grouse on Wednesday, a move that could bring restrictions on oil and gas drilling and other activity to preserve the bird’s habitat in parts of Colorado and Utah.
Colorado is seeking a delay in a decision by federal officials on whether to protect the Gunnison sage grouse, saying voluntary measures could help save the bird.
Coal industry representatives say lawsuits against mines in three Western states could have consequences across the U.S. as environmentalists seek changes in how mining is approved on federally owned reserves.
There are allegations that a company is filling a popular swimming and kayaking area in Denver with dangerous pollutants.
Conservation groups say they will go to court to force the Obama administration to do more to save the lesser prairie chicken.
An environmental group is threatening to sue Colorado, saying its management of water in the San Luis Valley is putting New Mexico’s stretch of the Rio Grande at risk.
The U.S. Fish and Wildlife Service is deciding if gray wolves should remain a protected species in Colorado.
A coal-fired power plant in Lamar would be put on standby under a proposed settlement with the environmental group WildEarth Guardians, which alleged the plant repeatedly violated the Clean Air Act.