"The global data bases have serious problems that render them useless for determining accurate long term temperature trends. Especially since most of the issues produce a warm bias in the data.
The Climategate whistleblower proved what those of us dealing with data for decades already knew. The data was degrading and was being manipulated. The IPCC and their supported scientists have worked to remove the pesky Medieval Warm Period, the Little Ice Age, and the period emailer Tom Wigley referred to as the “warm 1940s blip.” They have also worked to pump up the recent warm cycle that ended in 2001." - J. D'Aleo

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