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What Will El Niño be Like in The Future? For Answers, Scientists Look to The Past

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Caribbean ocean temperatures preserved in 5-million-year-old corals provide clues

Scientists are trying to predict the future behavior of El Nino -- the formation of warmer-than-usual ocean waters in the equatorial Pacific -- by looking back in time.

The journal Geology published new findings suggesting that 5 million years ago, El Nino occurred with about the same frequency as it does today.