A new power plant in the eastern Senegalese village of Kalom is generating more than just electricity. Powered by agricultural waste, the station has lit up homes, lightened women's domestic burdens and even put a little money in some residents' pockets.
Tucked against the rolling hills of South Africa’s Eastern Cape province, a small rural school has been turning its kitchen scraps, and agricultural and human waste into methane gas for cooking, and nutrient-rich fertiliser, and is even recycling its water.