Professor Michael Mann, Pennsylvania State University. Mann, 47, and colleagues are the climate scientists who brought the world the so-called hockey stick graph, showing a sharp rise in global temperatures in the last century. He responds to climate change deniers on his RealClimate blog. Graphic: Bloomberg Markets and Bloomberg Visual Data

Professor Michael Mann, Pennsylvania State University – Mann, 47, and colleagues are the climate scientists who brought the world the so-called hockey stick graph, showing a sharp rise in global temperatures in the last century. He responds to climate change deniers on his RealClimate blog.

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