It comes as no surprise, therefore, when researchers announce as they did this past September that Arctic sea ice extent is still below normal, continuing a years-long downward trend, covering less and less of the north polar seas with a frozen crust. On the heels of that announcement, came another, a little more puzzling. While Arctic sea ice was melting, Antarctic sea ice was at an all-time high. In 2014, sea ice surrounding Antarctica covered more of the southern oceans than it has since satellite record began in the late 1970s.
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The yin-yang of polar sea ice
