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is it the same thing that has been causing it to melt for the past 12,500 years
Who says it's been melting that long?
The Vikings had cattle farms in Greenland. They raised barley. It is just barely warm enough to do that now, yet the Vikings had several communities there for hundreds of years. So, what was the ice pack like then when it was warmer? We can't really take core samples and find out, can we?

It will have taken less than 50 years for the ice cap to melt. I'll suggest that reforming wouldn't take quite so long.
Fwiw: The climate had become harsher on the island starting in the mid-13th century. Summer temperatures fell, violent storms raged around the houses and the winters were bone-chillingly the mid-14th century, regular ship traffic with Norway and Iceland had ceased.
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