"U.S. officials are pressing a federal judge to lift his 2015 order blocking a proposed irrigation dam and fish passage on the Yellowstone River, warning that a rapidly-disappearing, ancient fish species faces a grim future with further delays to construction."

"Two federal agencies have approved a 2.4-mile-long open pit phosphate mine proposed by a Canadian company in southeastern Idaho."

"Thirty pronghorns, close cousins to antelope, died while crossing a frozen river in south central Idaho, in a very rare event for the sure-footed mammals, state wildlife managers said Tuesday."

"While many U.S. states have mandates and incentives to get more of their electricity from renewable energy, Republican legislators in Wyoming are proposing to cut the state off from its most abundant, clean resource—wind—and ensuring its continued dependence on coal."

"Wildlife advocates plan to challenge the approval of a new Yellowstone River dam aimed at benefiting Montana and North Dakota farmers that critics say could kill off a dwindling population of a fish species dating to the time of dinosaurs."

"The Public Utilities Commission of Nevada (PUCN) has voted to restore favorable rates for residential solar customers in NV Energy’s Sierra Pacific Power Company’s service territory -- exactly one year after the commission passed a controversial fee increase that brought the state’s residential solar market to a halt."

"President Barack Obama designated two national monuments Wednesday at sites in Utah and Nevada that have become key flashpoints over use of public land in the U.S. West, marking the administration's latest move to protect environmentally sensitive areas in its final days."