Arctic Sea Ice Extent Over the Last 1,450 YearsAs of August 26, Arctic sea ice appears to have broken the 2007 record for smallest daily extent of the satellite era. Arctic sea ice extent fell to 1.58 million square miles on August 26, 2012. This was 27,000 square miles (slightly bigger than the state of West Virginia) below the previous record low of 1.61 million square miles, set in September 2007.
The satellite record extends back only to the 1970's. However, we can, using other data, extend the ice coverage data back over 1,400 years as noted in the following graph.
And, LINK: http://www.nature.com/nature/journal/v479/n7374/full/nature10581.html
This puts the modern plunge in Arctic sea ice coverage in a longer historical perspective and clearly shows how dramatic this decrease has been during the last few years