Megacities are both booming and increasingly exposed to the risk of disastrous floods
These risks are greatest in the expanding megacities. The current rural population of about 1.5 billion will barely grow before heading into permanent decline in the 2040s, according to the UN, but two-thirds of the population growth between now and 2050 will be in cities. About half a billion new urbanites will be in just seven countries, most of them in the Asian and African monsoon belts: India, Nigeria, Pakistan, the Democratic Republic of Congo, Egypt, Bangladesh and Ethiopia.
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