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Biochar is a charcoal-like material created when biomass is heated in the absence of air or with very small, controlled amounts of oxygen. It can be used to capture and store carbon. This is because charcoal is a stable solid and rich in carbon content, and thus, can be used to lock carbon in the soil. Biochar also acts as a soil improver.
A sewage plant in Germany heats sewage to create biochar. The process is so successful that the plant is carbon negative - actually locking away carbon that would otherwise be in circulation.
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