-Important variant in pop. density
-Excludes city pop. and reports the number of rurals per unit of agriculturally productive land
-estimate of the pressure of people on the rural areas of a country
-also known as crude density
-most common and least satisfying expression of pop. density
-calculation of the number of people per unit area of land, usually in political boundaries
-only requires total pop. and total land area
-Overcrowding is a reflection not of numbers per unit area, but of carrying capacity of land given to the prevailing tech.
-Regions that devote to energy-intensive commercial agriculture that makes heavy use of irrigation, fertilizers, biocides, can support more people at a higher level of loving than one engaged in slash and burn agr.
-population is equal to carrying capacity of the area
-When animals feel overcrowded they stop having babies
-for us, population limitation must be self imposed
-when tot. pop. is divided by usable land area alone, resulting figure is this, whjich is an expression of pop. pressure exerted on agricultural land
-calculations depend on uncertain definitions of usable and cultivated land
-top of this represents a pop. size consisted with and supported by the exploitable resource base.
-It can express that humans are evidence of the ability to increase the carrying capacity of the land through technological advance
Zero Pop Growth
-condition for individual countries when births plus immigration equals deaths plus emigration
-this increases pop. of older, fewer younger, rise in median age, and growing old age dependency ratio