Urban growth

today, just over half of the world's population lives in cities. According whith predictions , this proportion will rise to 70% by 2050.
in the past, urban population was mainly concentrated in developed countries. However, today it is increasing rapidly in emerging and less developed countries.
urban growth has led to an increase in the number of megacities(urban areas with more than 10 million inhabitants).
There were only five megacities in 1975 but today there are more than 20.

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