Biggest heat spike in history

Associated Press
This undated file photo from the Colorado State Forest Service shows pine trees killed by beetles near Grandby, Colo. The U.S. Department of Agriculture warns in a report released Tuesday that big changes are in store for the nation's forests as global warming increases wildfires and insect infestations, and generates more frequent floods and droughts. (AP Photo/Colorado State Forest Service, Jen Chase)

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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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