Of course, the migration towards cities means dense populations and concentrated CO2 emissions from traffic and transportation. In 1800, six percent of humans were city dwellers even in 1970, only New York City and Tokyo qualified as “megacities” that were home to more than 10 million residents.įast-forward to today: The planet supports some 34 megacities, and cities themselves - occupying just two percent of the Earth’s surface - house more than half of the global population. What’s more, urban residency is expected to rise to 68 percent in the next 30 years. Alamy Even though cities have been centers of culture, ideas and industry since the Neolithic Revolution 12,000 years ago (!), today’s urban-centric global civilization is just a couple of hundred years old.
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