Recall the famous hockey stick temperature graph that landed Penn State professor Michael Mann in hot water.

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The second error was in the caption to a graph comparing the new temperature forecast with one from the past.

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Shown in the nearby graph is the measured annual temperature of the earth since 1989, just before the first report of the Intergovernmental Panel on Climate Change (IPCC).

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As you can see in the graph to the right, the temperature trends from the PI strongly correlate with that from MLOST.

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