Riots not catastrophe. Big difference. A catastrophic event would be something like world-wide flooding. I suppose if the food system collapsed completely (and

Riots not catastrophe. Big difference. A catastrophic event would be something like world-wide flooding. I suppose if the food system collapsed completely (and that is possible considering the way we grow most of our food (monoculture) - but very unlikely) that would be catastrophic. It would have to happen not just in one area, though. To really effect us all. In that case grab your gun. And protect your own garden. I think this study is predicting food riots in certain areas. Highly possible.