If all the world lived in one city… how big would it be?

Given the population of Earth is 7 billion

And that the density of cities ranges from

Mumbai – nearly 30,000 per square km

Through Sao Paolo at 9,000

Through London at 5,000  to

Copenhagen at 1,800

How much space would be needed for these different variants?

For inspiration see the website PER MILE.

For the densities of the top 125 cities see the City Mayor’s site here.


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