Urbanization has led to what are known as mega-cities, cities with a population of over 10 million people. These mega-cities have become so large that they often lead to terrible pollution, traffic, and extreme poverty.

Seth Dixon, Ph.D.‘s insight:

Over half the global population lives in cities, and the problems confronting these megacities will loom large for future sustainability issues–both at local and global scales. This list ranks the cities by city limits and governance jurisdiction (not by the expanded Metropolitan Statistical Area).  

Tags: urban, megacities, unit 7 cities.

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