Half of the global population already lives in cities – by 2050 two thirds of the world's people are expected to live in urban areas. The global population is at 7.2 billion, it is growing by 1billion every 12 years. By 2050 there should be 10 billion souls on this planet and the equivalent of nearly the current world population will be in urban areas with a need to be housed, nourished and have transport.
This series coalesces around a theme of the need for us to change and alerting the reader as to not just what needs to change, but how we have to change. You've noticed the title is -1?