[weweweoo]

Yep, collapse of farming is much bigger problem than the cooling itself. People live even in Siberia and Alaska / Northern Canada, but in much smaller quantities as it's harder to produce food. Europe has money to import food, or if it's not available, then take it by military means.

So, my bet is that in case of AMOC collapse Europeans simply elect authoritarian governments that will make some unfortunate developing countries colonies once again, and use them for farming. Given bad enough existential threat, things like rules-based order, human rights and democracy cease to matter, and the strong take what they want from the weaker parties. That's just how humans work.