Number of people living in cities with either perennial or seasonal water shortage (<100 L per person per day). Shortage numbers are shown for current conditions (ca. 2000), with projected population growth (2050), and with both population growth and climate change (2050). Errors bars are the range across various scenarios of population growth and climate change. Shortage numbers are shown for water available within the urban extent (0 km) as well as varying buffer distances, with a large spatial area over which water can be obtained necessarily reducing water shortage.
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