Part 63 (2/2)

United Nations Department of Economic and Social Affairs, ”World Urbanization Prospects: The 2011 Revision,” March 2012, esa.un.org/unpd/wup/pdf/WUP2011_Highlights.pdf.

64 population of the world at the beginning of the 1990s

Ibid.; U.S. Census Bureau, ”Total Midyear Population for the World: 19502050,”

65 increased tenfold over the last forty years

United Nations Department of Economic and Social Affairs, ”World Urbanization Prospects: The 2011 Revision.”

66 see a reduction in their share of the world's urban population

Ibid.

67 no more than 15 percent of people ever lived in urban areas

Susan Thomas, ”Urbanization as a Driver of Change,” Arup Journal, 2008.

68 still only 13 percent at the beginning of the twentieth century

Sukkoo Kim, ”Urbanization,” The New Palgrave Dictionary of Economics (New York: Palgrave Macmillan, 2008); Thomas, ”Urbanization as a Driver of Change.”

69 for the first time, more than half of us lived in cities

United Nations Department of Economic and Social Affairs, ”World Urbanization Prospects: The 2011 Revision.”

70 64 percent of the population in less developed countries living in cities

Ibid.

71 in 2013, twenty-three cities will have more than that number

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