AT its largest expanse this year, sea ice covered less than 17 million square kilometers (6.6 million square miles) of the Antarctic—an area that is 1 million square kilometers (almost 400,000 square miles) smaller than the previous record low set in 1986, according to preliminary figures released Monday by the National Snow and Ice Data Center at the University of Colorado Boulder. The number represents the smallest peak extent in almost 45 years of satellite records. 

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