I'm not dismissing anything, J...But, it was only a few years' back that the sceptics were the ones predicting colder winters and wetter summers resulting from, what they then called, the 'Freshing of the North Atlantic'?? But, anyway, whatever data there are that tie ice-extent to climate are all proxies...For example, all the evidence we have for the MWP is based on proxies...But, whatever, one of the key predictions made by AGW theory was that Arctic ice would retreat. And it has! But, that doesn't prove AGW theory to be correct; any more than the discovery of archaeopteryx proved Darwinian evolution.
As with evolution, only time will tell...