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by mehwoot 3342 days ago
http://nsidc.org/arcticseaicenews/charctic-interactive-sea-i...

When it's summer in the arctic, it is winter in the antarctic, whose area of ice is necessarily going to vastly outweigh the other when you add them together. So the trend will be less visible.

Just looking at arctic ice extent in summer, on that page, you can see the trend.