Indeed sea ice extend did increase from 2012 to 2013 Just as it did from 2007 to 2009 only to crash down again to a record low in 2012 from which it has recovered somewhat in 2013 Single years are irrelevant in looking at the long term trend and people who claim that a single year trend in one climate indicator somehow prove or disprove a trend don t know what they are doing or more likely they lie But feel free to update the article our own arctic sea ice decline is reasonably up to date In particular it has a current graph from NSIDC