The “hockey stick” chart, devised by Michael E. Mann, a meteorologist at Penn State, and his colleagues to show the sharp rise in world temperatures, was wielded by both sides in a duel of science and politics at a congressional hearing. Skeptics of climate-change theory savaged the chart — which had been elevated “to the level of an icon for greenhouse warming,” we reported — while the scientists did their best to explain their research. “Advocates on both sides of the climate-change debate,” said Mr. Mann, “have misrepresented the results for their own purposes.”
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