At the end of this period, which is to say ten thousand years ago, this began to change very dramatically. Growth at an infinitesimal rate became growth at a rapid rate. Starting at ten million, our population doubled not in nineteen thousand years but in five thousand years, bringing it to twenty million. The next doubling—doubling and a bit—took only two thousand years, bringing us to fifty million. The next doubling took only sixteen hundred years, bringing us to one hundred million. The next doubling took only fourteen hundred years—bringing us to two hundred million at the zero point of
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