Africa is currently the least urbanized region in the world, but this is changing fast. The urban population in Africa doubled from 205 million in 1990 to 400 million in 2010, and by 2050, it is expected to reach 1.23 billion. In a time of such urban growth, Africa is likely to experience some of the most severe impacts of climate change, particularly when it comes to water and food security. This places huge pressures on the growing urban populations. This eport shows that there is a way forward for a more sustainable future where restoration of ecosystems, often in the green hills and watersheds surrounding cities, can provide cheaper, efficient and resilient water supply systems in a changing world.