The nonprofit announced the winners of its annual Keeling Curve Prize on July 1 in Aspen. It also showcased past laureates, who credited their success to receiving the award.

The city of Aspen broke ground on the state of Colorado’s first car-to-pedestrian transition in 1976. A series of public events and installations honoring the landmark’s 50th anniversary this summer culminated in an art parade last month.

The Battlement Trail Fire is 99% contained. Fire officials said in a statement Monday evening that crews will remain on scene for the next few days to monitor hot spots and ensure the safety of nearby trails and recreation areas before declaring full containment.

A resident-led cooperative went under contract this week to buy their mobile home park for $23 million from Maryland-based Horizon Land Management. Cavern Springs residents hope to raise an additional $1.9 million before closing on the property in October to keep loan repayments down.

This year’s already strong El Niño is strengthening, a trend with potentially significant implications for the intense – and now tragic – fire season.

For years, author Heather Hansman has written about the Rocky Mountain West, from ski towns to water issues. In her latest book, “Fierce Country: The Untold Story of Three Women Who Ignited America’s Love for the Wild,” she turns to history, uncovering the lives of three women whose experiences helped shape the region, but whose stories have largely gone untold.

The U.S. is building more solar farms than ever. But as projects expand, they're also raising questions about where they belong. A new industry analysis suggests one of the biggest concerns — that solar is consuming too much prime farmland — may be overstated, especially in the American West.

Firefighters will now be able to use N95 masks on the fireline – building on a more limited, voluntary rollout of masking that started last fall. There will also be expanded access to showers, time for routine gear cleaning and so-called “clean air recovery periods” that can limit other risks.

The memo from the Smithsonian's secretary, Lonnie Bunch, responded to a White House report that calls the National Museum of American History driven by "a radical, activist ideology."

Gas prices have fluctuated since the U.S. and Israel launched a war on Iran, which disrupted shipping through the Strait of Hormuz and left consumers unsure of what they'll pay at the pump.

The Trump EPA calls Biden-era rules for cutting pollution from heavy trucks "unworkable." The proposed changes have been celebrated by trucking groups and denounced by environmental groups.

Kaye's collaboration with Smith began in 1971 and continues to this day. He says she taught him to trust his musical sensibilities — and to always keep evolving. Now 79, he has his first solo album.