It's interesting that you mention Polynesia. There was a book that came out at the tail end of the 90s called Guns, Germs and Steel. One of the hypothesis it also puts forth has to do with a culture's ability to thrive and evolve relative to its ease of access to high-quality protein. Apparently, absent the right kinds of protein, the brain's ability to use it's higher reasoning centers becomes compromised.
One of the geographic areas the author talks about is Papua New Guinea - yes, not exactly Polynesia, but right next door. The indigenous tribes in Papua New Guinea have compromised high-learning centers of the brain, and it's due in large part - according to the author - because of their inability to get consistent and quality sources of protein.
Perhaps Norway is a harsh climate physically, but it might also have abundant year-round sources of good protein that's high in Omega-3.
Interesting points.
There’s another thread on here about using insects as a souce of protein. Doesn’t New Guinea have lots of insects that could have been used as a source of quality protein,I mean,if we’re to believe that’s a good source of protein and all,then why would the New Guineans have suffered from a lack?(I’m being sarcastic over the idea of having to eat bugs)
It's those yummy reindeer.