Artcic sea ice extent for the last 1,450 years

Reconstructed Arctic sea ice extent over the past 1,450 years, from Kinnard et al. (2011).
Although more Arctic sea ice survived this year [2014] than in the record-shattering melt of 2012, in 2014 the ice was nevertheless at its 6th-lowest level in thousands of years. About 70% of the sea ice in the Arctic has disappeared over the past three decades, mainly due to human-caused global warming. This rapid decline is well outside “the normal range” of Arctic sea ice extent and volume.
Source: Sceptical Science