The vegan nonsensealists perhaps should consider the role of hunting and animal husbandry in the ability of humans to inhabit northern and semidesert regions of the planet and to sustain a population. It is also good idea to read about the causes of malnutrition in poor communities.
With 54% [1] of the world's population in urban areas already (rising to over 70% in the developed world) [1] that "role of hunting and animal husbandry in ... regions of the planet" is becoming an ever increasing rarity. By 2050 the 54% is expected to rise to 66% [2] so I doubt there will be many hunter gatherers left anywhere.
Here in 'the North' at longitude 10.757933 people only hunt for sport. Although they make the claim of culling for environmental reasons I have yet to see any elk or red deer without venturing deep into the forest on foot (so I'm calling BS).
>the causes of malnutrition in poor communities.
Obvious response would be to eradicate yet more rain-forest and open a McDonalds in all those poor countries. /s Malnutrition in poor communities (and I'm not sure to where you refer with that vague choice of phrase) is likely caused by factors that control diet, and not by diet in and of itself. In other words, it's the poverty itself causing malnutrition, not a lack of meat or forced vegetarianism.
That was a hint on the cause - why this evolutionary adaptation would emerge in the first place.
For everything else - think what would happen in any urban area if a few poultry farms would close for a month. India is one single example of mostly vegetarian traditionalist population, but even in India in the tribes populated north and north-west regions vegetarian diet cannot sustain a population.
Bonus question: how do you imagine a vegetarian Pakistan or any other middle east country?
