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Understanding climate change — key message 3

SOER 2010 Message (Deprecated) Published 28 Nov 2010
The extent of Arctic summer sea ice has declined by about 10 % per decade since 1979. The extent of the minimum ice cover in September 2007 was half the size of the normal minimum extent in the 1950s; the third lowest minimum extent occurred in September 2010. The summer ice is also getting thinner and younger.

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