An Urban Species: Stopping Stormwater Runoff with Trees

The idea that trees can build better cities has recently helped launch "million-tree" initiatives in Los Angeles, New York, Salt Lake City, Indianapolis, Denver, Houston and other cities, generally with a timetable of planting that many new trees within five or 10 years. Corporations and other organizations not normally associated with environmental causes have also signed on to the movement, with the American Bar Association, for instance, committing to planting a million trees by...