Currently about 20% of atmospheric carbon dioxide results from human action; about 20% of bird species on Earth have become extinct in the last 2000 years, almost all due to human activity; 40%+ of the planets land surface has been transformed by human society; we use about 50% of all accessible surface fresh water; 66% of marine fisheries are fully exploited, overexploited, or depleted. - Vitousek et al, 1997
Posted on: Wed, 05 Mar 2014 06:50:14 +0000
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