Humanity has exceeded 4 of 9 'planetary boundaries'
Madison WI (SPX) Jan 22, 2015 - An international team of researchers says climate change, the loss of biosphere integrity, land-system change, and altered biogeochemical cycles like phosphorus and nitrogen runoff have all passed beyond levels that put humanity in a "safe operating space." Civilization has crossed four of nine so-called planetary boundaries as the result of human activity, according to a report published ... more
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