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Diversity In Urban Forestry
Forest researchers say cities need to plant different kinds of trees. Many cities plant only a handful of species. (Photo courtesy of the US Forest Service)
Urban forest researchers say cities need different kinds of trees. Having too many of the same kind of trees encourages pests. Lester Graham reports:
Michigan State's Department of Forestry
A TIME article on urban forests
Producer: Lester Graham
Release Date: October 26, 2009
Running Time: :47