Snowmass patroller Katy Willcox has ski patrolled for a decade. As climate change makes winters increasingly unreliable, she decided that this season will be her last.

Highlands’ closure comes a few days after Buttermilk Mountain closed for the season. It marks the end of a historically warm ski season for the mountain.

The unseasonal warmth that broke longstanding temperature records across the West last week was a hit to Colorado’s already low snowpack. Climate change drove the heat wave, but scientists say it’s still an outlier in today’s world.

A record-breaking heat dome brought high temperatures that melted the snowpack considerably in the days leading up to the mountain’s closure.

Authors say: this could impact preparedness before wildfire season

The Trump administration is returning to 2012 emission rules, which it says have cut mercury pollution by 90%. Environmentalists say that’s not enough.

The Arizona Department of Water Resources is gearing up for a legal fight over Colorado River negotiations and has hired a law firm to represent the state.

Jay Weiner, the water attorney for the Fort Yuma Quechan Indian Tribe on the Colorado River in Arizona and California, discusses how tribes play a role in Colorado River governance, even if they’re not officially in the closed-door negotiations.

The historic heat wave that hit the western U.S. last week was made at least five times more likely due to climate change. Scientists say it would have been “virtually impossible” in a world without human-caused greenhouse gas emissions.

Aspen Highlands’ updated master plan submitted to the U.S. Forest Service includes a gondola to the top of Cloud Nine and an expansion of summer operations. When those projects might take shape isn’t clear.