Christa Roth has updated the GIZ HERA Micro-gasification Manual
It is extensively revised, and features good -clear descriptions of essential cooking stove topics, e.g. choosing appropriate fuels, cooking stoves and technologies.
She highlights all of the major micro-gasifier cooking stoves, and includes a new section on biochar, with good, clear graphics and descriptions for how to use biochar.
An essential reference for everyone's cooking stove library, and this is all work supported by the German people through GiZ, we appreciate their support of Christa's amazing work.