How acid rain can kill trees



For the first time, experiments have shown in detail how acid clouds can damage high-elevation forests in eastern North America.

The study focused on the way that acidic clouds affect red spruce, a dominant species in some eastern forests. Devastated stands of coniferous trees atop Whiteface Mtn,. N.Y., Mount Mitchell, N.C., and Camel's Hump, Vt., have become highly visible reminders of the damage that can be caused by acid deposition, which results primarily from fossil fuel combustion.