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The paper from McMichael is a welcome addition to data on the history of human occupation of the Amazon basin. The truth may be at an intermidiate step between either extreme: Jungle-Desert-of-a-Handful-of-Nomads vs. Eden-Manufactured-by-Hoards-of-Gardeners.
For previous articles about the proposal of a highly populated Amazon, see:
New discoveries concerning pre-Columbian settlements in the Amazon
Scientists find evidence discrediting theory Amazon was virtually unlivable
Paper challenges Amazonian population theories
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