An American Alpine Club librarian shelves books mailed back from members across the United States. The club’s collection includes more than 21,000 books and 50,000 images of interest to climate researchers. (Joe Purtell, Special to The Colorado Sun)

50,000 old photos in Golden are helping scientists answer new questions about climate change

American Alpine Club library's archive of images by early mountaineers holds clues for researchers documenting the retreat of glaciers worldwide

Outdoors Primary category in which blog post is published
Environment Primary category in which blog post is published

Colorado attorney general taking hard look at Trump administration’s clean-water regulations rollback

Democrat Phil Weiser says if the Environmental Protection Agency rolls back the Waters of the United State rule beyond a certain point, he could take legal action

Coloradans Primary category in which blog post is published

Parked: New state law brings hope to Colorado’s mobile-home residents

“There was a convergence.” Politics, a housing crisis and activism produced a long-awaited sign of hope for mobile-home owners.