On thin ice

By Adam Morton
Updated November 10 2012 - 12:18am, first published September 16 2011 - 3:15pm

THE Arctic Ocean in summer is vast, wind-beaten and bloody cold. Compared with a decade ago it is also increasingly blue. Until the turn of the millennium sea ice would routinely cover 14 million square kilometres of the ocean in winter's permanent midnight before melting to about half that under the 24-hour sun of summer.

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