

Kibera, Dharavi, Neza-Chalco-Itza, Khayelitsha, Cité Soleil, Makoko, Rocinha, Agbogbloshie are almost unpronounceable names that mean nothing to most of us. So, the issue of future circular cities is inexorably linked to the development of slums and their economies that, despite eluding official surveys, move huge matter flows in a necessarily and spontaneously circular way.

According to the United Nations, today, over 1.5 billion people live in informal settlements, and by 2030 that figure could soar to 3 billion.
