NOVELTY - Making biochar involves: placing waste biomass in a cylindrical retort chamber (2A), that extends outwardly at a first end and a second end from a fire box (2B); fueling pyrolysis by igniting the waste biomass placed in the cylindrical retort chamber such that biochar is created; and evacuating syngasses through at least one hole (2C) defined by the cylindrical retort chamber, such that the syngasses are driven out of the biomass and out of the retort chamber to be consumed by a fire in the fire box.    USE - For making biochar and as a clean burning kiln apparatus (claimed), to burn waste material, to produce biochar (charcoal) which is used as a soil amendment and for carbon storage.    ADVANTAGE - The kiln, is designed to burn waste material. Its operation is independent of any energy source and may be applied wherever there is a steady source of waste biomass that needs to be processed. The energy efficiency of the unit itself is very high by virtue of its shape, insulation, and thermal mass. Further, it is designed to burn continuously as the serial batches are processed. This represents a significant improvement over single batch retort kilns in which material is pyrolyzed by a fire which is started, burns, and burns out. The system comprises a retort chamber which is designed to direct the syngasses into the primary airflow feeding the firebox, thus becoming an additional fuel source. The Biochar Retort Kiln is designed for pyrolysis of waste biomass to produce biochar (charcoal used as a soil amendment). The char produced has value as a soil amendment and for carbon storage. The kiln is designed to be easy, safe, and economical to operate. It's incorporation into existing systems of operation of a farm, village, or campus is straightforward and lasting. The method and system is a simple, small scale, serial batch retort kiln for the purpose of pyrolyzing waste biomass to produce biochar, with heat as a valuable byproduct.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a clean burning kiln apparatus comprising: a firebox configured to fuel a fire using waste biomass; and a cylindrical retort chamber, sized to also contain woody biomass, extending through the fire box and terminating outside the firebox at a first and second end, the cylindrical retort chamber defines at least one hole, where when the firebox is used to achieve pyrolysis such that biochar is made from waste biomass, syngasses are driven out of the biomass and emerge from the retort chamber and are consumed by a fire in the firebox as an additional fuel source.    DESCRIPTION OF DRAWING(S) - The figure shows a firebox.    Cylindrical retort chamber (2A)    Fire box (2B)    Hole (2C)