20.4
Community model #1- the nomadic (semi-nomadic) method
 
  The nomadic method of human community life is associated with the necessity for groups of humans to continuously move in search of adequate food and water. While many races of humans have been identified as "nomads", very few true nomadic races have ever existed. Most races identified as nomadic are in fact semi-nomadic or seasonal- changing their location in sync with the seasonal variations in environment. This is consistent with the American Indians, the Australian Aborigines and even the Bushmen of Africa.  
  The main driver for movement is essentially the unsustainability of conditions for survival of a particular location during a particular season (each year, or even every few years). Given the need to be mobile, these groups of humans have historically been smaller in number, with fewer possessions than permanent settlements.  
 
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