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The world's population is concentrating in cities
The human population is more concentrated than ever before. Europe’s urban sprawl gradually fades as we move eastwards into the steppes of central Asia, soon to re-emerge into the dense networks of people and places in India, China and Japan. The attraction of Australia’s coasts is dramatically revealed, while North America appears to adopt a grid system not just for its streets and road networks, but for distribution of the cities themselves.
Cities exercise enormous control over national economies - even the global economy. They provide jobs, access to the best cultural, educational and health facilities and they act as hubs for communication and transport. Of course, they also cluster massive demands for energy, generate large quantities of waste, and concentrate pollution as well as social hardship.