To tackle this global crisis, we must look at people as a vital infrastructure for 21st century cities, not just to systems of pipes or cables According to the World Urbanization Prospects published by the United Nations in 2014, in the next three decades the rate of urbanisation will increase at a fast pace, adding 2.5 billion new dwellers to the current urban population. To accommodate this growth the world needs to create the equivalent of 300 new megacities, each roughly the size of London.