Biochar: A Carbon Negative Fuel! What is Biochar? When biomass is baked (heated) in the absence of oxygen - it becomes biochar retaining most of the feedstock’s carbon. The carbon in biochar resists degradation and can hold carbon in soils for hundreds to thousands of years! Biochar is mainly produced through pyrolysis or gasification — processes that heat biomass in the absence (or under reduction) of oxygen. In a crude way, it can also be made in pots or kilns in your backyard! Yes, it's that simple. However, the yield (amount of biochar produced per unit of biomass) depends greatly on the raw feedstock characteristics. Umm..lets say you are going to make a spicy chicken curry..so the amount of time you give to marinate the chicken will make the chicken nice and tender. Basically, it helps absorb the spices nicely. In the same way, if the raw biomass is processed well i.e. dry (moisture less than 10%) and smaller in size (3-6 mm), it will give the greatest biochar yield! Ho