Dr. TILMAN: Corn is a major source of food for the U.S. and the world.
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Dr. TILMAN: There's a lot of optimism about what are called the next generation of biofuels.
Swiss Foreign Ministry spokesman Tilman Renz described the case as "deeply disturbing" and said Swiss diplomats were assisting the couple.
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David Tilman is an ecologist at the University of Minnesota.
Professor Tilman, thanks very much for being with us.
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