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Every year, Arctic sea ice grows and extends through the winter.

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On March 7, 2017, Arctic sea ice reached its annual maximum extent, setting a new record low.

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A low September minimum extent and a warm winter contributed to the low Arctic ice maximum. 

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On February 13, the Arctic and Antarctic sea ice combined extent also set a new record.

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Globally, there was less sea ice than at any time since satellites began continuously tracking in 1979.