If the world's population reaches 10 billion by 2100 we can assume that 3 billion of these people will live in cities. This Urban Growth datascape shows the urban footprint of three billion people at four different typologies: 1) hyper density (NYC) 1, high density informal settlement (Mumbai) 2, medium density (Barcelona) 3, and suburban density (Los Angeles) 4.
1 United States Census Bureau, "New York County (Manhattan Borough), New York State & County QuickFacts," http://quickfacts.census.gov/qfd/states/36/36061.html (accessed April 5, 2015).
2 Clara Lewis, "Dharavi in Mumbai is no longer Asia's largest slum," The Times of India (July 6, 2011), http://timesofindia.indiatimes.com/india/Dharavi-in-Mumbai-is-no-longer-Asias-largest-slum/articleshow/9119450.cms?referral=PM.
4 United States Census Bureau (2010), https://www.census.gov/dataviz/visualizations/026/508.php.