Ross McKitrick, Financial Post Published: Wednesday, December 05, 2007
Below is the famous graph of "global average surface temperature," or "global temperature" for short. (please follow post title link to view graph) The data come from thermometers around the world, but between the thermometer readings and the final, famous, warming ramp, a lot of statistical modelling aims at removing known sources of exaggeration in the warming trend. In a new article just published in the Journal of Geophysical Research -- Atmospheres, a co-author and I have concluded that the manipulations for the steep post-1980 period are inadequate, and the above graph is an exaggeration. Along the way, I have also found that the United Nations agency promoting the global temperature graph has made false claims about the quality of its data.
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