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Ice core bubbles and carbon dioxide
Friday, January 13, 2012 18:40
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[h/t to Jake] It has been gospel among proponents of dangerous anthropogenic global warming that atmospheric content of carbon dioxide has never, in the last 400,000 years, risen above about 280ppmv (parts per million by volume) prior to the industrial revolution and its consequent burning of fossil fuels. Current concentration of atmospheric carbon dioxide is approximately 390ppmv. That contention is based on analysis of bubbles entrained in glacial ice and the unproven assumption that the composition of the bubbles accurately reflect the composition of earth’s atmosphere at the time the bubbles were formed.
Read more at Climate Change Dispatch
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