Humans Cross Another Danger Line for Planet

Posted by Scientific American: Mark Fischetti on January 15th, 2015
Scientific American: Five years go an impressive, international group of scientists unveiled nine biological and environmental “boundaries” that humankind should not cross in order to keep the earth a livable place. To its peril, the world had already crossed three of those safe limits: too much carbon dioxide in the atmosphere, too rapid a rate of species loss and too much pouring of nitrogen into rivers and oceans—primarily in the form of fertilizer runoff. Now we have succeeded in transgressing a fourth limit: the......

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