I was recently challenged by someone regarding the observation that 2015 extent is the lowest for the date in the current record. The individual tried to draw me into a fight (on someone else's page), which I refused for propriety's sake. Among the things he asserted and posted was this:http://adsabs.harvard.edu/abs/2007AGUFMPP11A0203F
He was using that to defend an assertion that 5-7000 years ago the Arctic was hotter, and that the current changes were no big thing.
I'm curious as to what people have to say about this, as I've got little understanding of it. My gut says that the conclusions are (1) unsupported and/or (2) being misrepresented. I'd rather not argue from my gut, however.
Feedback would be appreciated.