How Africa will become the center of the world's urban future

By 2100, 13 of the world’s 20 biggest urban areas will be in Africa.Growing at unprecedented rates, and shaped by forces both familiar and new, dozens of African cities will join the ranks of humanity’s biggest megalopolises between now and 2100. Several recent studies project that by the end of this century, Africa will be the only continent experiencing population growth. Thirteen of the world’s 20 biggest urban areas will be in Africa — up from just two today — as will more than a third of the world’s population.