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Biochar is charcoal produced for agricultural purposes. Organic feed stocks, ideally small diameter wood wastes, are heated in the absence of oxygen to produce charcoal in a process called pyrolysis. The process releases organic gasses and oils, which can be burned to produce electricity or used to propel the pyrolysis process, making the process self-sustaining. Charcoal in soil is very stable, resulting in carbon sequestration, and increases cation exchange capacity among other processes, reducing nutrient leaching, and increasing crop production under some circumstances.