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Sea ice covering the Arctic Ocean melted to its sixth lowest extent this year, while sea ice surrounding the Antarctic continent continued to break winter records.
The Arctic's sea ice cover appears to have reached its minimum extent on September 17, 2014.
Arctic sea ice reached its maximum extent for the year on March 21 at 14.91 million square kilometers.
A new study says year-to-year forecasts of the Arctic's summer ice extent are not yet reliable.
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