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Cooling threshold The end of each interglacial period over the past 800,000 years was characterized by large, abrupt cooling episodes that were distinct from the gradual decrease in insolation that was occurring. Why did these sudden coolings occur? Yinet al . used a suite of climate models to show that an insolation threshold exists, beneath which the slow decrease of energy from the sun leads to rapid climate cooling. This effect results from weakening of the Atlantic meridional overturning circulation involving sea ice feedbacks in the Nordic and Labrador Seas. —HJS

Insolation triggered abrupt weakening of Atlantic circulation at the end of interglacials