Don’t overlook the macro view of such a cooling event rather than just concentrating on you own situation and how you might lessen the negative impact of sever climate cooling.
Much of the world cannot feed itself already. The Middle East is a good example. With the exception of a few countries, food must be imported to feed the population. Food, like wheat and other grains, make up a large part of the diets, and these grains will be in very short supply for export from the producing countries like the US, Russia, Australia, Canada, and even China because the grow areas in these countries will have to shift south, if possible. Even with a shift southward, production qualities will be squeezed to much less than previously. Would the US continue to be the “Bread basket of the world”? I don’t think so, and those countries like Russia and Canada with even more northern grain producing areas would be impacted even worse. Those countries that can still produce will likely be inclined to hold that production for distribution to their own population. With 75% of the world starving, then what? I think we could see mass migration even within some countries and certainly from those countries unable to feed their population.
If you are one of a few who have the resources and knowledge to grow enough food for yourself and your family, you will be extremely fortunate. The majority will never be able to pull it off successfully regardless of how many books they’ve read on the subject. Just saying.