In calculating this datascape it was assumed that of the additional 3.9 billion people forecast to be added to the world's population by 2100, three billion of them will live in cities. To accommodate them the equivalent of 357 New York Cities (NYC) will need to be constructed in the next 84 years, at a steady rate this is 4.25 per annum.1.
1 United Nations, Department of Economic and Social Affairs, Population Division, World Population Prospects: The 2015 Revision, Key Findings and Advance Tables (2015). Available at https://esa.un.org/unpd/wpp/Publications/.