For several months now, Suzanne Noubissie, a housewife in Douala, Cameroon's economic capital, has been swapping her coal-burning stove for one that uses a recycled oil. The device, designed by a ...

Jacob Mwangi develops stoves that harness the power of old engine oil. [File, Standard] Widespread ... and cleaner compared to traditional burning methods," he says. Mwangi notes the presence ...