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overpopulation
occurs when the number of people exceeds the capacity of the environment to support life at a decent standard of living
demography
the scientific study of population characteristics
ecumene
the portion of Earth's surface occupied by permanent human settlement
arithmetic density
the total number of people divided by the total land area
physiological density
in a region, the number of people supported by a unit area of arable land
agricultural density
the ratio of the number of farmers to the amount of arable land
carrying cpacity
the maximum population size of a species that the environment can sustain indefinitely