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Submitted by PaulHampton on Fri, 15/06/2007 - 20:53

Arthur,

I don’t think your post is very helpful.

The IPCC report on the physical science basis of climate change said:
“The global atmospheric concentration of carbon dioxide has increased from a pre-industrial value of about 280 ppm to 379 ppm in 2005. The atmospheric concentration of carbon dioxide in 2005 exceeds by far the natural range over the last 650,000 years (180 to 300 ppm) as determined from ice cores. The annual carbon dioxide concentration growth rate was larger during the last 10 years (1995–2005 average: 1.9 ppm per year), than it has been since the beginning of continuous direct atmospheric measurements (1960–2005 average: 1.4 ppm per year) although there is year-to-year variability in growth rates.”

It concluded that, “the global increases in carbon dioxide concentration are due primarily to fossil fuel use and land-use change, while those of methane and nitrous oxide are primarily due to agriculture”. Increases in temperature are “very likely” due to increased greenhouse gas concentrations resulting from human activity.

I think there are lags between CO2 emissions and warming – and anyway the contraction in the Depression was relatively brief – which might explain your point.

In any case, we’re better off accepting the reality of climate change and developing a programme to mitigate warming than on this kind of speculation.

Paul

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