Well, we&#x27;re also turning a substantial fraction of our corn output into ethanol to burn for fuel.  Stop that, and the feed used for animals, factor in a much reduced population, and the numbers probably work out.<p><i>How many people even know what to do with a sack of flour and a firepit.</i><p>That&#x27;s where things start getting really sticky.  <i>Nuclear War Survival Skills</i> has a simple design for a pestle made out of three pipes bound together, in this scenario people are not likely to get anything as refined as flour.  Then boil it into porridge.