A new study out of MIT has determined that the destructive power of hurricanes in the North Atlantic and North Pacific has nearly doubled over the past 30 years, at least in part because of human-induced global warming. The scientist — Kerry Emanuel — says there is a “clear correlation” between increasing strength and length of storms and a temperature increase on the surface of the sea. His findings appear in the journal Nature. Some of the nation’s leading hurricane forecasters, including William Gray of Colorado State University, have criticized the findings. In an interview with the Boston Globe, Gray said that hurricanes are not intensifying and that the cause of the rising ocean temperature is natural, not man-made.