a new, giant statue, you can continue to live afterwards exactly as you did before. That is sustainable. But if your way of life leads you to invent a more efficient method of farming, and to cure a disease that has been killing many children, that is unsustainable. The population grows because children who would have died survive; meanwhile, fewer of them are needed to work in the fields. And so there is no way to continue as before. You have to live the solution, and to set about solving the new problems that this creates. It is because of this unsustainability that the island of Britain,
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