By 2100, all of the world's 20 largest megacities will be located in the developing world, with the majority in Africa. What implications will this shift have for the future of the global economy, climate, and the welfare of these urban populations?

For many, Africa may seem like a continent with a sealed fate. But Africa is a vast continent, replete with nations growing and developing rapidly. Despite challenges that continue to assail it, Africa seems set to play an increasing role in world affairs. The question is, will African nations be able to follow the example of many Asian nations and do it sooner rather than later?