They state lots of “facts” without support, and when they do, its as reported by the Super Duper Sky Is Falling Radical Environmentalist Foundation.
Wattsupwiththat.com has reams of charts on this subject:
http://wattsupwiththat.com/reference-pages/sea-ice-page/
Interesting, as you get to the Antarctic charts it looks as though ice cover there exceeds the norm at about the same level as Arctic ice cover recedes.
The Earth is in majestic balance.