Basically, massive farming processes will halt and the weather will be really nasty for a few years, with possible perpetual winter.
Yeah? So what! My ancestors survived years that had no summers in England. That was around 1312 AD and later. That was when the glaciers started growing, up until circa 1850 AD.
Where I live is about 50-miles up the Columbia River from the Pacific. We can collect water from snow or rain. Salmon in the river, deer or elk in the woods, we can eat that protein. Filbert nut trees grown well here, and are abundant.
Really nasty weather, you say? Artichokes, asparagus, cabbage and cauliflower love it. Since I’m allergic to wheat, I won’t miss bread any more than I do now.