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In the past 100 years, average temperatures on Earth have changed by 1.3 degrees. Previously, that large of a swing took 5,000 years. That's the word from researchers who pored over temperature data going back to the end of the last ice age.

Above: In the past 100 years, average temperatures on Earth have changed by 1.3 degrees. Previously, that large of a swing took 5,000 years. That's the word from researchers who pored over temperature data going back to the end of the last ice age.

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