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Science 15 June 2007:
Vol. 316. no. 5831, p. 1564
DOI: 10.1126/science.316.5831.1564a
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Letters
How to Submit a Letter to the Editor
Technical Comment Abstracts
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COMMENT ON "Carbon-Negative Biofuels from Low-Input High-Diversity Grassland Biomass"
Michael P. Russelle, R. Vance Morey, John M. Baker, Paul M. Porter, Hans-Joachim G. Jung
Abstract: Tilman et al. (Reports, 8 December 2006, p. 1598) argued that low-input high-diversity grasslands can provide a substantial proportion of global energy needs. We contend that their conclusions are not substantiated by their experimental protocol. The authors understated the management inputs required to establish prairies, extrapolated globally from site-specific results, and presented potentially misleading energy accounting.
Full text at www.sciencemag.org/cgi/content/full/316/5831/1567b
RESPONSE TO COMMENTS ON "Carbon-Negative Biofuels from Low-Input High-Diversity Grassland Biomass"
David Tilman, Jason Hill, Clarence Lehman
Abstract: We discovered that biofuels from low-input high-diversity mixtures of native perennial prairie plants grown on degraded soil can provide similar bioenergy gains and greater greenhouse gas benefits than current corn ethanol produced from crops grown in monoculture on fertile soil with high inputs. Russelle et al.'s technical concerns are refuted by a substantial body of research on prairie ecosystems and managed perennial grasslands.
Full text at www.sciencemag.org/cgi/content/full/316/5831/1567c
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