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The recent climate change may be acting to slow down deep ocean currents with potentially serious consequences for the planet's future, a study warns. Deep currents act as conveyer belts, channelling heat, carbon, oxygen and nutrients around the globe. A new study by the University of Pennsylvania's Irina Marinov and Raffaele Bernardello and colleagues from McGill University has found that recent climate change may be acting to slow down one of these conveyer belts - with potentially serious consequences for the future of the planet's climate.