The Hockey Schtick
"..It is scientifically-improper to graft a thermometer record to a paleoclimate (e.g. tree-rings) proxy for temperature because trees are not thermometers, they are not calibrated to thermometers, there are many more important variables than temperature that can affect tree rings such as precipitation, location, CO2 (plant food) levels, cloudiness, soil quality, solar activity, weather patterns, etc. for which there is no means to sort out. ..."
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