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 Stories About: Bill McKibben AND climate AND climate science AND greenhouse-gas emissions AND James Hansen
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Parting company with McKibben and, maybe, Hansen
What is the safe upper limit for atmospheric CO2? |
Joseph Romm |
31 Dec 2007 |
Gristmill |
| The nation's top climate scientist, NASA's James Hansen, apparently now believes 'the safe upper limit for atmospheric CO2 is no more than 350 ppm,' according to an op-ed by the great environmental writer Bill McKibben. Yet while preindustrial levels were 280, we're now already at more than 380 and rising 2 ppm a year! Like many people, in the 1990s I believed 550 was the target needed to avoid climate catastrophe -- but now it's clear that: 550 ppm would lea ... |
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| Topics: Bill McKibben, climate, climate science, greenhouse-gas emissions, James Hansen (all these topics) |
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