Arctic sea ice has reached its lowest ever recorded extent, in 'dramatic changes', which signal that man-made global warming is having a major impact on the polar region.
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http://www.guardian.co.uk/environment/2012/sep/14/arctic-sea-ice-smallest-extent?intcmp=122
Drag the slider across this map to see how the ice has shrunk between 1979 and 2012
http://www.guardian.co.uk/environment/interactive/2012/sep/14/arctic-sea-ice-before-after-interactive?intcmp=122
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