If the whole world’s population of 6.9 billion people were to concentrate into one giant metropolis, how big would this city be?
The graphic below shows the size of territory needed to accommodate the entire earth’s population according to the density of the mentioned cities. The difference clearly shows suburban crawl and the average area of land available for each person in different urban areas of the world. 
[via: Archdaily] [References: www.persquaremile.com]
