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Many scientists now agree that the earth's climate is warming.
But there are some critics who have disagreed. That's because climate models predict a particular amount of warming to occur globally. But some of the heat predicted by climate models has, so far, been unaccounted for. So skeptics point out that the models and reality don't match up. He and his colleagues have spent the better part of the last decade rescuing old temperature data collected from the world's oceans.