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They didn't check the source data, or verify the accuracy of the original measuring methodology. Furthermore, they never verified the accuracy or validity of the adjustment criteria for changes in measuring methods, or even changes in the measurement environments.

And that doesn't even touch on determination of a cause and effect relationship between human activity and perceived climactic changes.

I could as easily, and correctly, attribute global warming to the human caused deforestation of the Mediterranean basin over the past 2 thousand years.