Biggest heat spike in history

Associated Press
In this Thursday, Aug. 2 2012 photo, Dr. James E. Hansen head of the NASA Goddard Institute for Space Studies gestures during an interview with the Associated Press at his office in New York.  (AP Photo/Mary Altaffer)

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An analysis by a top government scientist says the extreme heat and drought seen in the U.S., Europe and other regions in recent years must be global warming. A new study looking at 11,000 years of climate temperatures shows the world in the middle of a dramatic U-turn, lurching from near-record cooling to a heat spike.



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