Beginning in the 1990s and on the basis of the study of terra preta, scholars proposed that indigenous peoples in the Amazonian rainforests:

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The study of terra preta, which is a type of very fertile soil found in the Amazon, led scholars to propose that indigenous peoples had used slash and char techniques. This method involves partially burning vegetation to create charcoal, which enriches the soil, rather than slash and burn, which depletes it.

Beginning in the 1990s and on the Basis of the Study