new definition, which defines a city as a contiguous geographic area with at least 50,000 inhabitants at an average population density of 1,500 people per square kilometer
for - definition - city - a geographic area with - at least 50,000 inhabitants - an average population density of 1,500 people/square kilometer - stats - 25% of people live in towns - 48 % of people live in cities - 25% of people live in villages - towns and cities
- according to this new definition, which standardizes the definition of city that has, hitherto been quite varied, 48% of humanity lives in cities (2015)