Sustainable cities - Who put the civil into civilisation?

How do we define civilisation? Who created the conditions for the quality of life we now enjoy? Who have been the greatest civilisers? What are our key life support systems and who provides the skills which create them? What do we want from our urban environment and who can give it to us? Are our cities in the prime of life, or are they geriatric? Are they sustainable? These and other challenges are considered and addressed in this review of the infrastructure of modern society and of the choices we face as we embrace the twenty-first century, with the emphasis on the urban environment.