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Q&A How large would a mega structure have to be to host 1 billion people indefinitely?

Ruins of buildings, abandoned cities and suburbs dot the coasts of Earth's landmasses, inhabited by wild animals and the pieces of a once vibrant civilization. The oceans are relatively empty, the ...

7 answers  ·  posted 5y ago by Alex‭  ·  last activity 5y ago by Alex‭

Question culture apocalypse population food earth agriculture