20 Aug '11, 1am

Multiple lines of evidence make it very clear that the rise in atmospheric CO₂ is due to human emissions

Multiple lines of evidence make it very clear that the rise in atmospheric CO₂ is due to human emissions

"Salby’s argument is that the usual evidence given for the rise in CO2 being man-made is mistaken. It’s usually taken to be the fact that as carbon dioxide concentrations in the atmosphere increase, the 1 per cent of CO2 that’s the heavier carbon isotope ratio c13 declines in proportion. Plants, which produced our coal and oil, prefer the lighter c12 isotope. Hence, it must be our gasses that caused this relative decline. But that conclusion holds true only if there are no other sources of c12 increases which are not human caused. Salby says there are - the huge increases in carbon dioxide concentrations caused by such things as spells of warming and El Ninos, which cause concentration levels to increase independently of human emissions. He suggests that its warmth which tends to produce more CO2, rather than vice versa - which, incidentally is the story of the past recove...

Full article: http://www.skepticalscience.com/Murry-Salby-CO2-rise-natu...

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