"the Ecological Footprints of all cities are higher than the world-average biocapacity available for each person (1.7 gha...indicating that, if the entire world population lived like the citizens of these countries, humanity would require between 1.9 and 2.4 planets"
https://www.sciencedirect.com/science/article/pii/S0264275119302306#f0010
https://www.sciencedirect.com/science/article/pii/S0264275119302306#f0010
