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Science 21 December 2001:
Vol. 294. no. 5551, pp. 2490 - 2491
DOI: 10.1126/science.1066317
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Perspectives

Also see the archival list of Science's Compass: Enhanced Perspectives

GLOBAL CHANGE:
Enhanced: Sharing the Garden

Christopher B. Field

Human activities have profound impacts on our planet, but these impacts can be difficult to measure accurately. In 1986, an influential study used the fraction of Earth's total plant growth or net primary production that is appropriated by humans as a measure. In his Perspective, Field discusses the reassessment of this value by Rojstaczer et al. and highlights ways in which estimates of human impacts can be further improved.

The author is at the Carnegie Institution of Washington, Stanford, CA 94305, USA. E-mail: chris{at}globalecology.stanford.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
From the Cover: Quantifying and mapping the human appropriation of net primary production in earth's terrestrial ecosystems.
H. Haberl, K. H. Erb, F. Krausmann, V. Gaube, A. Bondeau, C. Plutzar, S. Gingrich, W. Lucht, and M. Fischer-Kowalski (2007)
PNAS 104, 12942-12947
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Science. ISSN 0036-8075 (print), 1095-9203 (online)