The World's Busiest Cities: Mexico City, surviving the chaos of a city with over 22 million people

More than half of the world's population now lives in cities. 

WATCH: Monarch butterflies take multiple generations to travel to their annual winter habitat in Mexico

Watch the above video and see the hidden systems that run Mexico City, a sprawling megalopolis of over 22 million people.

This is the second in a series exploring how four cities around the globe, including Hong Kong, Delhi, Moscow, operate.

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