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.
Xcel Energy Inc. is providing $447,000 for environmental projects in north Denver to resolve a lawsuit alleging clean air violations.
An environmental group is asking a federal appeals court to review part of Colorado’s plan for cutting air pollution and haze.
A federal appeals court is upholding the National Park Service’s decision not to reintroduce wolves to Rocky Mountain National Park to control the elk population.
The National Park Service acted properly when it ruled out using wolves to control the elk population in Rocky Mountain National Park, government lawyers argued Thursday before a federal appeals court.