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And from a paper recently presented at the European Geosciences Union meeting by Steirou and Koutsoyiannis who investigated how the homogenization procedure affected temperature trends worldwide.

"We investigate the methods used for the adjustment of inhomogeneities of temperature time series covering the last 100 years. Based on a systematic study of scientific literature, we classify and evaluate the observed inhomogeneities in historical and modern time series, as well as their adjustment methods....

"From the global database GHCN-Monthly Version 2, we examine all stations containing both raw and adjusted data that satisfy certain criteria of continuity and distribution over the globe. In the United States of America, because of the large number of available stations, stations were chosen after a suitable sampling. In total we analyzed 181 stations globally...."

They find "the global temperature increase during the last century is smaller than 0.7-0.8°C" and greater than 0.4°C.

Investigation of methods for hydroclimatic data homogenization
http://itia.ntua.gr/en/docinfo/1212/

DB2
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