The ancient Amazonian Indians knew how to do it!
http://news.nationalgeographic.com/n...es-amazon.html
ingeniously engineered soilIf recreated, the engineered soil could feed the hungry and may even help fight global warming, experts suggest."As a result you get social stratification, hierarchy, intertwined settlement systems, very large scale,"Because the soil would apparently remain fertile for centuries, "they don't have to cut down the forest constantly and send it up into the atmosphere," he said.


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