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Tracking the Ecological Overshoot of the Human Economy
Mathis Wackernagel, Niels B. Schulz, Diana Deumling, Alejandro Callejas Linares, Martin Jenkins, Valerie Kapos, Chad Monfreda, Jonathan Loh, Norman Myers, Richard Norgaard and Jørgen Randers
Proceedings of the National Academy of Sciences of the United States of America
Vol. 99, No. 14 (Jul. 9, 2002), pp. 9266-9271
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/3059187
Page Count: 6
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Sustainability requires living within the regenerative capacity of the biosphere. In an attempt to measure the extent to which humanity satisfies this requirement, we use existing data to translate human demand on the environment into the area required for the production of food and other goods, together with the absorption of wastes. Our accounts indicate that human demand may well have exceeded the biosphere's regenerative capacity since the 1980s. According to this preliminary and exploratory assessment, humanity's load corresponded to 70% of the capacity of the global biosphere in 1961, and grew to 120% in 1999.
Proceedings of the National Academy of Sciences of the United States of America © 2002 National Academy of Sciences