Cities are the future, and future cities will be smart. Urbanisation is one of the continuing trends of the twenty first century. In 1800, just 2% of the world’s population was urbanised. In 2008, that figure passed 50%. If current growth trends continue, 65-75% of the world’s population will live in urban centres by 2050. Almost all of this 15-25% projected growth will take place in the developing world.