Oh Bullcrap. These “researches” don’t have a clue why the Vikings left.
I ran across a book by a lady who did a thorough on the Greenlanders. There are quite details in the Catholic Church about these people. She seem to conclude that the young men were either recruited or kidnapped by the Portuguese sea farriers who were quite active in the north Atlantic during the time of the population decline. With out the males there was no sustaining of the limited population.
I don’t have the name of the book handy, but will look for it.
I recall a show where they thought (with some evidence) that the Viking’s crops (they were primarily farmers) were going bad due to the Little Ice Age.
They then surmised that they could not (would not?) make the change to living the native lifestyle of hunting seals and stuff because the Vikings were Christian, and would not participate in the native’s pagon rituals prior to each hunt.
So, they left (or died) because they were Christian farmers I guess. And served them right no doubt!
Vikings were nonpareil wanderers, sea farers and explorers by nature. Restless and always on the move looking for new lands and people to dominate. I believe they left Greenland because it was getting colder and not rising seas...they could have just moved further inland but instead they moved on to New Foundland.
My guess is it was the excessive cold and limited food sources and agricultural opportunities.
I sure as heck wouldn't live there