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Scalable, economical, and stable sequestration of agricultural fixed carbon

Eli Yablonovitch,H. Deckman

Published 2023 in Proceedings of the National Academy of Sciences of the United States of America

ABSTRACT

Significance This article presents a carbon-negative solution to the world’s CO2 emissions by stably sequestering carbon that has been photosynthetically fixed by cultivated plants. The technology buries salted biomass in a dry environment within an engineered biolandfill. The key to stable sequestration is the recognition that a dry environment assisted by salt preserves biomass. Preservation by salt has actually been known since Biblical times. Salt effectively reduces the relative humidity of the sequestered biomass, preventing decomposition for thousands of years. Current agricultural and biolandfill costs indicate US$60/tonne of sequestered CO2, corresponding to ~US$0.53 per gallon of gasoline. A significant fraction of world emissions can be sequestered.

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