The fertile soil may be a massive, overlooked source of stored carbon.
The fact that Kuikuro people make dark earth today is a “pretty strong argument” that people were also making it in the past, says Paul Baker, a geochemist at Duke University who was not involved in the research.
Perron and colleagues reviewed interviews of Kuikuro people conducted by a Kuikuro filmmaker in 2018. Those conversations revealed that Kuikuro villagers actively make dark earth —“When you plant where there is no eegepe, the soil is weak,” explained elder Kanu Kuikuro in one of the interviews. “That is why we throw the ash, manioc peelings and manioc pulp.”
These analyses also revealed that dark earth holds twice the amount of carbon as surrounding soils on average. Infrared scans of the Xingu region suggest that the area is pockmarked with dark earth, and that as much as roughly 9 megatons of carbon — the annual carbon emissions of a small, industrialized country — may have gone unaccounted in the area, the researchers reported at the meeting.
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