:the estimation of temperatures from 1400 to 1980 contains collation errors, unjustifiable truncation or extrapolation of source data, obsolete data, geographical location errors, incorrect calculation of principal components and other quality control defects. [http://www.climateaudit.org/pdf/mcintyre.mckitrick.2003.pdf] | :the estimation of temperatures from 1400 to 1980 contains collation errors, unjustifiable truncation or extrapolation of source data, obsolete data, geographical location errors, incorrect calculation of principal components and other quality control defects. [http://www.climateaudit.org/pdf/mcintyre.mckitrick.2003.pdf] |