9 Environmental Boundaries We Don’t Want to Cross

International Water Management Institute researcher David Molden said the 4,000 cubic kilometer ceiling on freshwater use – roughly one-third of all freshwater – “may be too high.” Myles Allen, an Oxford University climatologist, argued that CO2 emissions should be counted in a different way. Cristian Samper, director of the U.S. Natural History Museum, said that taxonomic family loss is a more relevant measure than species loss.

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Source: http://www.wired.com/wiredscience/2009/09/earth-us