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View Diary: Climate Change Denialism -- A view from the top of the food chain (71 comments)

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  •  280 ppm was the pre-industrial maximum (1+ / 0-)
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    During the nearly 500,000-year period covered by ice cores, there has been considerable variation in atmospheric CO2 concentrations.  These variations correspond to the waxing and waning of ice ages brought on by planetary obliquity and precession, with concentrations ranging from a minimum of about 180 ppm during ice ages to a maximum of about 280 ppm during interglacial periods.  Thus, using the 280 ppm maximum as the pre-industrial baseline or norm somewhat understates the magnitude of the problem.  

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