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Science 15 June 2007:
Vol. 316. no. 5831, p. 1567
DOI: 10.1126/science.1139388
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Technical Comments

Comment on "Carbon-Negative Biofuels from Low-Input High-Diversity Grassland Biomass"

Michael P. Russelle,1* R. Vance Morey,2 John M. Baker,1 Paul M. Porter,3 Hans-Joachim G. Jung1

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.

1 U.S. Department of Agriculture, Agricultural Research Service, St. Paul, MN 55108, USA.
2 Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, MN 55108, USA.
3 Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108, USA.

* To whom correspondence should be addressed: E-mail: michael.russelle{at}ars.usda.org

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Science. ISSN 0036-8075 (print), 1095-9203 (online)