A massive oceanic heat wave is rolling toward the eastern Pacific Ocean right now, a telltale signal of a brewing El Niño.
An El Niño is a natural climate cycle marked by warmer-than-average temperatures in the waters of the equatorial Pacific Ocean. Forecasters won't make their final call until later this summer, but all signs point to anEl Niño this year, perhaps one as powerful as what occurred in 1982 or 1997. But even a weak El Niño could hike global temperatures to record levels, scientists think.
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