Comment by Turskarama

6000 years ago was about the time of the last interglacial period so likely it was ice free at that time.

As was stated "normal" is not really a useful framing. It has at various times been both "normal" for the glaciers to extend much further south, and it has also been "normal" for the earth to have no glaciers at all. When thinking about climate change the issue is not that the climate IS changing, but rather how quickly. There is no evidence that global climate has ever changed as quickly as it is today, with the fastest rates we have evidence for being on the order of 1 degree every thousand years, as compared to the current rate of about 1 degree per 50 years.