This video from youtube uses data from NASA to give an overview of what happens every year to the Arctic sea ice. It explains that in the last decade the sea ice has shrunk dramatically with 2012 having the lowest ice cover on record. Sea currents and winds break up the ice and transport it into warmer waters. The video speculates in the future that the Arctic could become ice free in the summer, worrying for polar bears and other organisms that rely on the sea ice for hunting.
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