Well, 50,000 years ago, if you were hungry you could find some edible plants, or throw a stick at an animal and eat it. In today's society there is limited hun

Well, 50,000 years ago, if you were hungry you could find some edible plants, or throw a stick at an animal and eat it. In today's society there is limited hunting and the land that grows food is privately held. And if you try to build a shelter anywhere on land that you don't own, it will get torn down. Not to mention the fact that you really can't own land -- property taxes makes it a rental at best. Now one thing that would be neat -- what if most of the utility ground cover was actually directly edible by humans? Imagine replacing all the wild grass and weeds with edible vegetables. Of course they would have to be bio-engineered so that they are desirable for people, grow like weeds, yet not get consumed by vermin.