Part of the problem is that, apart from a handful of megacities in the West and the Far East, we don't know that much about the thousands of cities in Africa, in Latin America, in Asia, where 90 percent of all future population growth is set to take place.
Parte del problema es que, excluyendo a pocas megaciudades de Occidente y el lejano Oriente, sabemos poco sobre las miles de ciudades de África, América Latina, Asia, que es donde ocurrirá el 90 % del crecimiento demográfico mundial.