Urbanization — An Emerging Humanitarian Disaster

Abstract
In 2008, the proportion of the world's population living in urban areas crossed the 50% mark. The current rates of urbanization suggest that in China, 870 million people — more than half the population — will be living in cities within less than a decade, and the capital of Botswana, Gaborone, will grow from 186,000 to 500,000 inhabitants by 2020.1 Most observers believe that essentially all population growth from now on will be in cities: the urban population is projected to grow to 4.9 billion by 2030, increasing by 1.6 billion while the rural population shrinks by 28 million.1

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