The Hockey Schtick
"A new paper published in Nature Geoscience reconstructs temperatures of the West Antarctic ice sheet from ice cores and shows that temperatures have declined over the past 2,000 years. The proxy for temperature, an isotope of oxygen [d18O], shows a decline over the past 2,000 years [figure 3 below], and thus indicates a decrease in temperature. A blowup of the past 200 years [figure 2 below] shows that the d18O temperature proxy at the end of the record in ~2010 had been exceeded many times over the past 200 years, including during the 1800's, 1940's, and 1990's."
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