Losing a species is a tragedy in itself, but it also has a larger impact on the local environment. In this hour of Science Friday, we'll review the latest studies that show that a diverse ecosystem is a healthy ecosystem. Plus, a look at microbial diversity. Guests: David Tilman Professor of Ecology University of Minnesota Minneapolis, MN Walter Reid Vice President for Programs World Resources Institute Washington, D.C. Abigail Salyers Professor of Microbiology University of Illinois Urbana, IL Listeners call in



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