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A comment on Amazon rainforest was transformed over 2,000 years ago by mysterious earthworks. Parent comment

Re:Amazon rainforest was transformed over 2,000 years ago by... by steamer25 on Tuesday February 28, 2017 @11:30AM (#13754935)
This video by CGP Grey covers some similar issues/hypotheses: https://www.youtube.com/watch?v=JEYh5WACqEk
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