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July 1936 was the hottest on record in the midwest, while January 1936 was one of the coldest. Twelve degrees above normal in the summer and twelve degrees below normal in the winter. CO2 controls the climate, and must have increased about 3,000 ppm between January and July.
http://docs.lib.noaa.gov/rescue/mwr/064/mwr-064-07-c1.pdf
http://docs.lib.noaa.gov/rescue/mwr/064/mwr-064-01-c1.pdf
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