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If Ocean Heat Pump Switches On, Expect to Feel It

Scientists are chipping away at a question that has dominated public climate change discussions in the U.S. the last few years: Where's the heat? Despite unchecked carbon pollution, warming felt on the Earth's surface has slowed since 1998.

Clues keep pointing to the Pacific Ocean, and a new paper in Proceedings of the National Academy of Sciences (PNAS) predicts that the temperatures will rise again toward the end of this year.