Almost a third of Colorado's aspen trees could be dead in the next few years. The white-barked tree is suffering from what scientists call "sudden aspen decline" or SAD. The die-off troubles environmentalists and business owners. The number of tourists checking out the fall foliage is down this year — partly due to the aspen die-off.
Aspen Die-Off May Hurt Colorado's Economy
News & Features Kirk Siegler · KUNC-FM ·