Technical Comments

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

Science  15 Jun 2007:
Vol. 316, Issue 5831, pp. 1567
DOI: 10.1126/science.1139388

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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.

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