"An overflow crowd showed up Monday to plead with — and in some cases berate — state regulators over several oil and gas drilling operations slated for neighborhoods along the Front Range."

"The cleanup of a northwest Montana community where health professionals say hundreds of people have been killed by asbestos exposure entered a new phase Thursday as officials turn their focus to keeping residents safe over the long term. The five-member Libby Asbestos Superfund Advisory Team met for the first time after being established by the Montana Legislature earlier this year."

"Once staring into the oblivion that is extinction, bison have rebounded in number and prestige to be called the United States’ national mammal. Yet those in Yellowstone National Park don’t fully carry the prestige that distinction bestows."

"Environmentalists have sued a U.S. agency to try to stop it from allowing oil and gas drilling on a vast stretch of federal land in Nevada, where the government is reversing protections put in place nine months ago under the Obama administration."

"An appeals court granted a request Monday from President Donald Trump's administration to halt a plan for new pollution controls at Utah's oldest coal-fired power plants aimed at reducing haze near national parks."

"Fire officials said on Monday they had effectively stopped the uncontrolled spread of the largest wildfire in Los Angeles history, with a little help from cooler weather, but were still working to contain it."

"Solar advocates win a surprising victory in Nevada."