http://en.wikipedia.org/wiki/Total_fertility_rate From Wikipedia, the free encyclopedia A world map showing countries by total fertility rate (TFR), according to the CIA World Factbook‘s 2013 data. Purple – 7–8 childrenPink – 6–7 childrenRed…
http://en.wikipedia.org/wiki/Carrying_capacity From Wikipedia, the free encyclopedia The carrying capacity of a biological species in an environment is the maximum population size of the species that the environment can sustain indefinitely, given the food, habitat, water and other necessities available…
http://en.wikipedia.org/wiki/Optimum_populationFrom Wikipedia, the free encyclopedia Optimum population refers to the size of a population that produces the best results according to chosen end targets. One text from 1926 presented a single end target…