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Demography
The scientific study of population characteristics

Overpopulation
The relationship between a total number of people on Earth and the availability of resources.

Ecumene
The portion of Earth's surface permanently occupied by human settlement.

Arithmetic Density
The total number of people divided by total land area.

Physiological Density
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.

