Biggest heat spike in history

Associated Press
FILE - In this Aug. 19, 2003 file photo, the Ibardin lake, which provides drinking water to the southern French cities of Hendaye, Biriatu and Urrugne, is almost dry due to the recent heat wave, near the French-Spanish border. The relentless, weather-gone-crazy type of heat that has blistered the United States and other parts of the world in recent years is so rare and off-the-charts that it can't be anything but man-made global warming, a new statistical analysis from a top government scientist says. (AP Photo/Bob Edme, File)

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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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