What if humanity was driven to near extinction and there were only a hundred people to survive in an intentionally prepared underground cavern. What would they need to survive for a hundred years with very limited access to the outside world? This is a problem rather like the Biosphere 2, but with a larger population and no escape.
I thought I had some new ideas on this subject, but when this Probaway site was searched with word havens it (lifehavens) was obvious I covered this eleven years ago and no one was interested. A parallel series of posts are listed under the words Earthark Project and it also has a resounding audience of nobody. These posts were my attempt to help humanity survive, but of the 7.7 billion people it appears no one is looking past the enjoyments of today.