This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. ALPINE, Calif. — In an effort to prevent ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. LOVELAND PASS, Colo. — They’ve been referred ...

Scientists hope an endangered listing may help preserve alpine ash forests, but the forestry industry is raising concerns that it could result in further decline.

We all know what tree line is in Colorado: the point above which trees don’t grow. But what determines tree line: Cold? Soil conditions? Precipitation? And is tree line different in various parts of ...