Tall, spindly and grey, croton trees grow everywhere in Kenya. Although they tend to be used for little more than firewood or shade, their nuts turn out to be an excellent source of biofuel. This overlooked plant could be the answer to Africa’s growing demand for cheap, low-carbon energy.
https://www.theguardian.com/sustainable-business/2017/jan/10/croton-oil-biofuels-kenya-food-security-farming-africa