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U of M, University of Minnesota Study 5 Main Points Can't grow enough corn, University of Minnesota Study 5 Main Points limits biodiversity, David Tillman and Clarence Lehman, University of Minnesota Study 5 Main Points Net Energy, Doesn't cut enough greenhouse gases rather barely reduces levels, corn isn't "green" demands high-nitrogen fertilizers, University of Minnesota Study headed up by David Tillman, 25% more energy yields only about Net Energy, University of Minnesota Study done at Cedar Creek, University of Minnesota Study 5 Main Points Doesn't cut enough greenhouse gases