Two-Degree Global Warming Limit Is Called a `Prescription for Disaster’

SAN FRANCISCO A mantra that has driven global negotiations on carbon dioxide emissions for years has been that policy-makers must prevent warming of more than two degrees Celsius to prevent apocalyptic climate outcomes. And, two degrees has been a point of no return, a limit directly or indirectly agreed to by negotiators at international climate talks. James Hansen, director of the NASA Goddard Institute for Space Studies in New York, whose data since the 1980s has been central to setting that benchmark, said today that two degrees is too much.

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Two-Degree Global Warming Limit Is Called a `Prescription for Disaster’