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In this study researchers show that closing the Bering Strait and preventing its throughflow between the Pacific and Arctic Oceans during the glacial period can lead to the emergence of stronger hysteresis behavior of the ocean conveyor belt circulation to create conditions that are conducive to triggering abrupt climate transitions. They argued that even for greenhouse warming, abrupt climate transitions are unlikely to occur as the Bering Strait remains open. [Source: Proceedings of the National Academy of Sciences of the United States of America]
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