English: Biochar (charcoal) is produced in this double burn barrel. Chunks of woody biomass are placed within an inner barrel, feedstock to "cook" the inner biomass is placed around the inner barrel, and then the feedstock is ignited. This converts the woody biomass into almost pure carbon. The carbon biochar is then used to amend compost. This sequesters carbon, and provides a good home more microbes in the soil. Some advanced biochar units can capture the heat for heating homes, water, air, and even produce electricity with the aid of a stirling engine.
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