Book excerpt: As more and more people inhabit the Earth and live longer on it, Super Cities, will explode with populations of 20, 30, even 100 millions or more. But how will these cities accommodate such masses? Who will build them and where? How can they be sustained and their inhabitants provided for? Here, Jeff Dondero imagines the super cities of the future and explores the ways in which they can be sustainably built, how transportation will move masses of people without cars, how people will be fed and where waste will go, and how we will move to cities underground, under the sea, in the atmosphere, into space and on to other planets. It describes some of the smart systems for buildings and homes and some of the new ways food and materials enough for such masses will be supplied. Will super cities be the answer to our bursting population? And if they will, how can we best sustain and supply them? Dondero offers suggestions and a blueprint for the future.