Most cities needed to accommodate the new urban dwellers in Africa have yet to be built. Urban expansion of existing cities is only one side of the coin. A mid-sized city like Gwagwalada, less than 60 kilometres west of Nigeria’s capital Abuja, has increased its population sixfold in the past two decades only. The megacities catch the headlines, but most of the rapid and often unplanned urbanisation will take place in mid-sized cities. The urban population is forecast to more than double in Africa and grow by half in Asia by 2050. Urban expansion has been most pronounced in Asia and Africa, and it is likely to remain like this in the coming decades. In the same period, the number of cities with one million people has doubled. It outnumbers those in the developed world by four to one. Since 1975, the number of megacities with over ten million inhabitants has tripled in the Global South. As the cities of the Global South expand, can they grow green? The momentum of megacities It could reach between 85 and 100 million inhabitants by 2100. Nigeria’s economic powerhouse Lagos has doubled its population over the last two decades to 24 million.
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