: More than 4 billion people —over 56% of the global population—currently live in cities.
Rapid growth has historically outpaced infrastructure, leading to overcrowding, substandard housing, and public health risks. Today's planners face a complex web of modern obstacles: Urbanization - Our World in Data The Urbanization Revolution: Planning a New Age...
: While there were only two megacities (populations over 10 million) in the 1950s—New York and Tokyo—there are now 34 , a number expected to reach 43 by 2030. Challenges for the New Century : More than 4 billion people —over 56%
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