Human emissions of carbon dioxide began a sharp rise from 1945. But, temperatures, it seems, may have plummeted over half the globe during the next few decades. Just how large or how insignificant was that decline?
Frank Lansner has found an historical graph of northern hemisphere temperatures from the mid 70′s, and it shows a serious decline in temperatures from 1940 to 1975. It’s a decline so large that it wipes out the gains made in the first half of the century, and brings temperatures right back to what they were circa 1910. The graph was not peer reviewed, but presumably it was based on the best information available at the time. In any case, if all the global records are not available to check, it’s impossible to know how accurate or not this graph is. The decline apparently recorded was a whopping 0.5°C.
But, three decades later, by the time Brohan and the CRU graphed temperatures in 2006 from the same old time period, the data had been adjusted (surprise), so that what was a fall of 0.5°C had become just a drop of 0.15°C. Seventy percent of the cooling was gone.
Maybe they had good reasons for making [...]
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