There is a concerted effort across cities in the southwest to plant more trees. For example, Phoenix has launched a "Trees ...

The U.S. Forest Service is looking for volunteers to help plant tens of thousands of trees in mountains surrounding Flagstaff ...

Cheyenne Ingel, a scientist with the Desert Research Institute, says there’s a lot going on in a tree. She explains that ...

Have you ever looked at a mountain and wondered why there were trees on one side but none on the other? Or noticed different ...

And not long thereafter, a handful of these toadflax plants were collected from English gardens and toted across the Atlantic ...

Arizona Gov. Katie Hobbs called for a federal investigation into the Park Service's handling of the fire, which was sparked ...