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Dr Pettitt said Jersey became connected to the west of France during the Ice Age, when water was locked up at the poles as ice and sea levels were low.
BBC: Jersey Post mammoth stamps mark archaeological history
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And now the Arctic's upper layers are getting less dense, for several reasons: melting Arctic glaciers, rising surface-water temperatures, increased precipitation and an absence of salt concentrations resulting from sea-ice formation.
ECONOMIST: The science
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Absorption is particularly fast in cold water so the Arctic is especially susceptible, and the recent decreases in summer sea ice have exposed more sea surface to atmospheric CO2.
BBC: Arctic Ocean 'acidifying rapidly'
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That means more melting ice in the Arctic, dumping fresh water into the salty sea and making a mess of the all-important Gulf jet stream, which makes northern U.S. habitable.
FORBES: Climate Catastrophe Nearer, Al Gore Gives Us About 90 More Years
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As the ice thins, more solar radiation can enter the ocean and warm the sea water, which will cause icecaps to melt more quickly.
CNN: Nature - Satellite sees through Arctic ice for signs of climate change