Half of the world’s inhabitants—3.6 billion people—live in cities. The proportion is the highest in mankind’s history, and it is growing fast. By 2030, 60 percent of the population—5 billion people—will be city dwellers. The ways in which cities develop and cope with such rapid urbanization are of huge importance to citizens. But they matter to others too. Cities are the main source of global economic growth and productivity, and they account for most resource consumption and greenhouse gas emissions. Urban development therefore matters to the well-being of all the world’s occupants.
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