Our new brick cookstove uses almost any fuel such as maize stalks and cobs, rice straw, dung, small sticks and elephant grass stalks. This allows women to stop walking hours to collect firewood from forests. It slows deforestation. Each stove will save more than one tonne of CO2e per year.
It is simple to make and use. Made with just 36 common bricks, the stove cost less than USD 1 to make. Here is a summary and here is a video: