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The Greenland settlements had 2000+ people between 1000-1350. Last written record is from 1408. Ten generations is completely sustainable by my standards. htt

• runarberg 5y ago
  Stories of Norse Greenlanders visiting Iceland mention their poverty. They would come to Iceland and taste beer and bread for the first time in their lives. They lived, yes, but they definitely did not thrive over there. Perhaps they were sustainable, but they were on the very edge of being so, and when conditions worsened (worse climate, lost trade routes, competition, etc.), they weren’t any more and these settlements were abandoned.