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Michael Mann, climate scientist at Pennsylvania State University:

"That's a tough one. But I think I'd have to go with a body of work – several studies – establishing a more definitive link between climate change and certain types of weather extremes (heat waves and intense rainfall events/flooding), and studies by Stefan Rahmstorf, Tad Pfeffer and others suggesting a significant upward revision of projected sea level rise this century relative to the Intergovernmental Panel on Climate Change Fourth Assessment Report (IPCC AR4) estimates, with the latest studies suggesting that 6 feet (1.8 meters) of global sea level rise under business-as-usual emissions is not out of the question.