compost creates income
Sustainable cities looks like an interesting website – it seems less manipulative and eager to sell and broader than most.
From the article Nairobi: Compost creates income for park maintenance:
Lack of toilet facilities and waste dominating public places is a reality in many places all over the world. A slum in Nairobi, Kenya, has come up with a possible answer to the challenge by creating parks that contain toilets and compost facilities. The compostable waste of the area is used to produce compost, which is sold locally as fertilizer and generates income used to maintain the park and toilets. The case may inspire others to bring sustainable economy into waste management systems and parks.