A 2019 study concluded that trees are one of the most cost-effective ways to combat climate change. The researchers estimate a trillion trees are needed on Earth, in addition to the current 3 trillion ...

Aspen trees are the mostly widely distributed native tree species in North America, found throughout many northern U.S. states, the entire length of the Rocky Mountains, and a huge swath ...

Observers who are noticing dying conifer trees around the Roaring Fork River watershed can blame the Douglas-fir beetle. The valley has avoided many of the insect infestations that have decimated ...