It's the basis for the Mann-made warming hoax or the basis for the hypothesis of man-made global warming via CO2. It featured a long time to eliminate the 'Medieval Warm Period'. The MWP debunks the Mann-made hoax so Mann made the hockeystick graph, and not by accident...
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Google: 'ipcc 1990 temperature graph' for the MWP and 'hockey stick graph'for Mann made warming.
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Good question. But does it matter? Ross M (sorry, the spelling of the University of Guelph’s professors name evades me today) debunked the model the graph was derived from rather a long time ago. You should already know this.
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