Biochar is created by heating organic material under conditions of limited or no oxygen, There are many ways to achieve this result. The type of organic matter (or feedstock) that is used and the conditions under which a biochar is produced greatly affect its relative quality as a soil amendment, The most important measures of biochar quality appear to be high adsorption and cation exchange capacities and low levels of mobile matter (tars, resins, and other short-lived compounds), Production of biochar generally releases more energy than it consumes, depending on the moisture content of the feedstock Heat, oil, and gas that are released can be recovered for other uses, including the production of electricity. A sustainable model of biochar production primarily uses waste biomass, such as greenwaste from municipal landscaping, forestry, or agriculture.