NPR's Christopher Joyce interviewed WERC Ecologist Nate Stephenson for a segment on the drought's effects on trees in the Sierra Nevada, including the iconic giant sequoia. Stephenson collaborates with the University of California, Berkeley and Stanford University-Carnegie Institution for Science to study what kills trees during a severe drought — insects, disease, dehydration? What could this mean for western forests as the climate changes and serious droughts become more frequent? You can listen to the interview or read the transcript on NPR's website.