The Grand Canyon State sues over Trump administration rules that would sharply reduce the amount of water Arizona receives from the river.

An appeals court hearing could determine whether feds reconsider Endangered Species Act protections for wolves across the West.

And climate change’s fingerprints are all over it. The water year started off on a rainy note, especially in the San Juan ...

Wildfires across the West have renewed concerns over the fate of water quality in the aftermath. Fire retardants used to slow the spread of a blaze add to the worries.

Her husband spent years working in Carbon County’s namesake coal mines. In this pocket of central Utah, energy and the ...

Some populations of scarlet monkeyflowers can evolve fast enough to save themselves from climate change-induced drought. This is the first time researchers have documented evolutionary “self-rescue” ...

A trailer parked near the border of Bureau of Land Management and National Forest lands north of Nucla, Colorado. Credit: Luna Anna Archey Colorado’s vote next month on whether to amend the state ...

This story was originally published by Slate and is republished here through a partnership with Climate Desk. Shark Tank’s Kevin O’Leary wants to bring the world’s largest A.I. campus to Utah. Over ...

The western stretch of the Arkansas River, which flows from its headwaters in the Rocky Mountains across the plains of southeastern Colorado, is in trouble. That trouble is compounded by uncertainty ...

Sometime in late June or early July, in a part of western Wyoming informally called the Golden Triangle, sage grouse start to roam. Moms and chicks relocate from dry, harsh desert to higher, greener ...