Cities from the south and the north of Africa deliver the best environmental performance of all major African cities. This is the conclusion of the African Green City Index, a unique study commissioned by Siemens and conducted by the independent research organization Economist Intelligence Unit (EIU). During the past months, the EIU analyzed the aims and achievements of 15 major cities in 11 African countries with respect to environmental performance and policies. Cape Town, Durban and Johannesburg from the south, Casablanca and Tunis from the north as well as Accra, Ghana, rank above average. Africa is urbanizing faster than any continent in the world: by 2035 half of all Africans are expected to live in urban areas. Already, informal settlements, electricity and water supply, waste management and sanitation are urgent challenges in many African cities.