The author needs to look at this in a wider context. GG&S may be defensible, but Collapse is pretty horrible, trying to force environmental explanations at the cost of downplaying European slave raids (Easter Islands) or utter absurdity (Diamond's suggestion that Viking Greenlanders preferred to starve than to eat fish). Diamond had a thesis and forced the facts to fit in the expense of integrity. After Collapse , it…
It is hard to tell because in the current political climate, there is such animosity against anybody mentioning human impacts on the 'environment', that someone could just state something obvious, like maybe we should stop polluting so much, and be called a 'woke liberal elitist'. So is his book Collapse forcing an environmental theory, or are you so against any theory of 'human caused environmental problems', that y…
This was categorically refuted by bone analysis showing that Vikings did eat seaborne food[0]. The current hypothesis is that the fish bones were used to feed animals or burnt.
The more important point that the thesis was absurd in the first place. The Vikings were seafarers, and we have no record of any such taboos. You can't invent a food taboo completely against their way of life and with absolutely no written evidence out of thin air. At the very least, there was an extremely high level of proof needed, and Diamond doesn't even try to get near.
Moreover, We have a 5000 years history of human food taboos, and as a rule when people face starvation or just illness, the taboos get shunted aside. Even the fanatically devoted Ghandi compromised and drunk milk. The one exception I can think of in all of human history is Nongqawuse, and even that was: not a food taboo but based on existing faith, encouraged by a foreign power and disobeyed by a non-trivial faction. You didn't get complete extinction even there.
[0] https://www.europhysicsnews.org/articles/epn/abs/2002/03/epn...
As for Easter Islands, there are serious arguments that there wasn't any environmental problem and the population survived well enough (e.g. [1]). More importantly, the Europe slave raids are documented to have carried off a third-to-half of the population, the more educated part. In other contexts of similar casualty levels, downplaying that would be called way worse.
[1] https://www.npr.org/sections/krulwich/2013/12/09/249728994/w...