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An on/off switch for the Atlantic's currents The Atlantic Meridional Overturning Circulation carries warm water from the tropics into the North Atlantic (in red), where the water cools and sinks before flowing back south (in blue). When the AMOC is flowing quickly, western Europe enjoys a wet and warm climate. Scientists have likened the system to a conveyor belt: Once warmer water reaches the area around the UK, it cools and sinks to the bottom of the Labrador and Nordic Seas. Then that cold water makes a U-turn and snakes along the ocean floor, down to Antarctica's Southern Ocean. But if this circ
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