A global study shows treelines are not just moving upward. Climate, human activity, and fires shape where trees grow.

Deck the Trees is in full swing for another year. Trees depicting this year’s theme, “Let Heaven and Nature Sing,” went up at the Monte Vista Hotel and around town the week after Thanksgiving. The ...

Add Yahoo as a preferred source to see more of our stories on Google. John Poltrack / Getty Images There’s a lot to love about mountain ash, a delightful native tree that fits easily into urban and ...

In the high-elevation slopes of the northern Rocky Mountains and the Pacific Northwest, the whitebark pine (WBP) tree has been standing strong. For years, everything was perfect. Everything proceeded ...

Although Camelback Santa will not make an appearance in his jolly red hiking attire this year, this annual holiday tradition continues with a special tree dedicated to first responders and medical ...