Now home to more than 21,000,000 people, Beijing is considered to be one of the most populous cities in the world with 16 urban, suburban, and rural districts. The city’s population has grown by 53% in the course of 14 years*, with a population density of a whopping 1,230 people per square meter in 2011.

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Overpopulation poses several problems, including (but not exclusive to) an overburdened public transportation system, shortages in water supply and landfill space, heavy air pollution, and skyrocketing property prices.

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Beijing’s CDP has increased its efforts to control population growth by limiting the entry of rural-to-urban migrant Chinese workers, who would be redirected to emerging cities in Western and Central China, instead.

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* 2000-2013 figures; according to a Bloomberg report