The City Mouse in the Country

Hope is the poor man's bread. Somehow I started watching a video about "Poor Man's bread" that was bread made from various flours in the 1700's and early 1800's.  This popularity of this type of bread has waxed and waned in popularity at times when wheat production faltered for whatever reason. The history of bread is an interesting one and their have been lots of substitutes for wheat bread throughout times of drought or diseases; or when other issues like poor soil and wheat diseases affected production.  Wheat has always been the preferred crop when it came to bread. While wheat farming practices and yields have certainly increased since the late 1700's this most important of crops face new problems in a ever heating world. I started to wonder....could some of these substitutes make sense in today's world?  Or better yet, what about the world of tomorrow?  What would replace wheat bread if the crops failed today? Quick searches for things lik