alfin: its work is to insulate, direct the flame, and then to crcreate the chimney e effect, h is neededcient burning of the fuel. so in that way, it is going to reduce all the smoke and the other products o of combustion which are not healthy to the user of the stove and to the environment. reporter: the clay cylinder is surrounded with another heat-insulating layer of clay. that stops the cooker from losing heat and keeps it stable. the producer guarantees the stove for at least seven years. the likano company developed the design together with the women who use the cookers. scientists from neighboring uganda have tested how much wood they can save with it. clarisse: actually, we made a monitoring and evaluation. we are finding that it goes to 60% comparing to the previous consumption. reporter: claudine used to spend seven euros a week on firewood. now, she only spends a third of that. she has already bought five sheep with the money she's saved. they provide the family with wool and meat. and d her two school-aged sons n use their time to study and do homework, as they no longer have