I agree rich countries could buy food up to a point, but if the us and canada had drastically lower yields for a few years, there would be world wide shortages, countries would limit exports eventually.
I asked the question about what would northern countries do because the volcanic eruption impacts seemed to be more focused on the north in the article. But of course the world is connected, and the south is relatively poorer, and we are all connected, and there's not that much excess food. When a huge eruption does occur, or other destructive things like a CME, it will affect the world.
