"North America and Europe's urban areas already account for about 70-80% of the regions' populations, and these are expected to stabilise at these levels.
Developing nations are shouldering the vast majority of this burden, leaving them struggling to cope with the huge influx of people into urban areas. Some cities' populations are 40 times larger than what they were in 1950."
Half the world lives in cities... is there some way we can work that into a t-shirt?
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