My takeaway from reading Grænlendinga saga and Eiríks saga rauða was that Iceland is where you went when you got kicked out of Norway for killing too many people, and Greenland is where you went when you got kicked out of Iceland for killing too many people.
climate change, man-made or otherwise, and the need to adapt pushed humans beyond the conventional borders of their tribes/clans. however, the precipitating event on the move from the mainland was a lot of murder.
I think the edition I read mentioned that the Norse society in Greenland dwindled to nothing because of an inability to adapt to the conditions created by the Little Ice Age; sounds like this podcast has the same idea.
We first named Greenland Greenland to trick people to go there instead of Iceland.
Now we want people to come - so we are manipulating math and logic on a scale never seen before.
Be vary of any data that points to Iceland as being a good place to live in terms of weather.
The truth is "in Iceland, the weather is trying to kill you!"