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Science 21 December 2001:
Vol. 294. no. 5551, p. 2425
DOI: 10.1126/science.294.5551.2425c
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This Week in Science

A study by Vitousek et al., 15 years ago, based largely on extrapolations from limited field-based studies, estimated that humans co-opt about 42% of the global terrestrial production. Rojstaczer et al. (p. 2549; see the Perspective by Field) now provide an update based on recent, mainly satellite-based surveys and an error analysis. They reach a similar conclusion through this different methodology, but caution that the uncertainties are still very large for several key parameters, namely, the productivity of agricultural land and the biomass of secondary forests.




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