More than a third of all tree species worldwide face extinction, threatening ecosystems, plants, animals and economies around the world, experts warned Monday. In all, 38% of trees are at risk, ...

Oak trees have been around for more than 50 million years, with individual trees easily living 1,000 years. One of the oldest oak trees in the U.S. is believed to be at least 2,624 years old. The ...

Of all the Christmas traditions, there's nothing quite as magical as picking out a tree. Picture this: You're strolling through rows of luscious pine, fir, and spruce trees on a brisk afternoon at a ...