Biochar carbon removal is the process of converting organic matter into a stable, carbon-rich material (biochar) and then adding it to soil in order to sequester the associated carbon found within the organic matter. This is achieved by heating said organic matter in a low-oxygen environment through pyrolysis which stabilises the carbon within it, carbon which would have otherwise been released once the organic matter had decomposed. The resulting biochar is applied to soil where it acts as a carbon sink for millennia.