103+Lecture+8 - Geographiesof Population Demography...

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Geographies of  Population
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Demography Demography  is the  study of the  characteristics of  human populations. Geodemography : the  study the distribution  of human population  and the reasons for  such distribution.
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World Population Density Crude/arithmetic density = total number of people total land area. New Jersey 8,707,739 persons = 1,174 persons per sq mile 7,417.34 sq miles
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Local Variations in Population Density The world population is not  evenly distributed across the  globe.  10% of the land north of the equator  close to water  lowlands The physical environment does  not fully determine density. resources  economic, cultural, and social  factors accessibility topography soil fertility climate and weather water availability water quality jobs transportation family religious institutions
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US Population Density 2009
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For most of human history, humans have not been very numerous compared to other species. Human Population History
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Population Future: Stabilization or Crisis? Projections of maximum population size: Low  8 billion Medium   9.3  billion High   13   billion
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Most populated countries The world's population is expected to  reach 8 billion by the year 2020.  
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Population Growth Population change:  D P = natural growth + net migration      =    (BR   DR)     +     (I   E) Influenced by such factors as: Demographic structure Economic development Healthcare availability Social class Occupation Place of residence  World Natural Growth Rate = 1.14%/year 150 million births 50 million deaths
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Population Doubling Times Rule of Thumb: In exponentially growing populations: 70 / annual % growth = doubling time 70 / 1% = 70 years 70 / 2% = 35 years
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Variations in Population Growth Rates and Wealth Rates of growth vary across the world. Places with slow  population growth rates tend to be more  affluent  than those with fast growth rates.  Childbearing: subsistence agriculture economies:  children often seen as an asset  and source of labor (more children) industrialized societies:  children actually become an economic  liability until they reach adulthood (fewer children)
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Vital Statistics Fertility: the actual production of offspring. Total Fertility Rate (TFR)
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103+Lecture+8 - Geographiesof Population Demography...

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