Giant sequoia trees stressed by drought

14623381925_813238018d_zLast fall, scientists noticed that giant sequoias trees were losing a startling amount of foliage, something they’d never seen before, and a sign that the ancient trees were stressed by drought. Now, they’re racing to figure out if the trees are in trouble, and trying to forecast their future. The Guardian, September 2015Photo courtesy Flickr user Chris Eason.