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Peter M. Vitousek,
Harold A. Mooney,
Jane Lubchenco,
Jerry M. Melillo
Human alteration of Earth is substantial and growing. Between
one-third and one-half of the land surface has been transformedby
human action; the carbon dioxide concentration in the atmospherehas
increased by nearly 30 percent since the beginning of theIndustrial
Revolution; more atmospheric nitrogen is fixed by humanitythan by all
natural terrestrial sources combined; more than halfof all accessible
surface fresh water is put to use by humanity;and about one-quarter of
the bird species on Earth have been drivento extinction. By these and
other standards, it is clear thatwe live on a human-dominated planet.
P. M. Vitousek and H. A. Mooney are in the Department of
Biological Sciences, Stanford University, Stanford, CA 94305, USA.
J. Lubchenco is in the Department of Zoology, Oregon State University,
Corvallis, OR 97331, USA. J. M. Melillo is at the U.S. Office
of Science and Technology Policy, Old Executive Office Building, Room
443, Washington, DC 20502, USA.
The editors suggest the following Related Resources on Science sites:
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[DOI: 10.1126/science.308.5726.1257b] |Full Text »|PDF »
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