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, ...

While studying the ancient trees of Chile's rainforests, scientists discovered a hidden, underground world that's actually vital to the ecosystem's survival.

A few things on this planet are old enough to make history books look recent, and that includes some living trees that have weathered through tons of challenges. Scientists have dated them, and locals ...