Cities are growing. And they are growing fast. A contemporary city is generally defined as a population center of twenty-five thousand or more people. And settlements fitting this qualification are added by the week.7 Today, three-quarters of the world lives in metropolitan centers.8 In fact, the single largest move of people in human history is taking place as I write this: rural Chinese are migrating to major cities almost exclusively for the purpose of employment. In seemingly every corner of the world, urbanization is swelling with little sign of slowing down. In the West, the vast
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