Cracks in sheets of polar sea-ice viewed from a jet flying over the arctic. With global warming, arctic sea-ice has been melting earlier and refreezing later in recent years making a completely ice-free arctic during summer months a possibility in coming | Editorial picture agency Felix Features

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Cracks in sheets of polar sea-ice viewed from a plane flying over the Arctic.

Cracks in sheets of polar sea-ice viewed from a plane flying over the Arctic.

Copyright:Panos Pictures /Felix Features Created: 9 Mar 2008

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