Population+Change+p.II

Population+Change+p.II - Population Change p.II Population...

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Population Change p.II Population change and distribution Geography for a Changing World Anna Szyniszewska
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Outline Characteristics of populations How we measure population change? Population distribution Demographic Transition Model Over and under population
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How we measure population Change? 1. Rate of natural increase (RNI) 2. Population growth Remember these concepts? 1. Birth rate 2. Mortality rate 3. Net migration
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Rate of Natural Increase (RNI) Depicts the annual growth rate for a country or region as a percentage increase. This statistic is produced by subtracting a population’s number of deaths in a given year from its annual number of births. World: 19.95(births)-8.2(deaths)=11.75(births per 1,000) RNI=+1.175%
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0 5 10 15 20 25 30 35 40 1950- 1955 1955- 1960 1960- 1965 1965- 1970 1970- 1975 1975- 1980 1980- 1985 1985- 1990 1990- 1995 1995- 2000 2000- 2005 Birth rate Death rate Natural Increase Source: United Nations, World Population Prospects: The 2004 Revision , 2005. Births or deaths / 1000
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Population Growth 1. Rate of Natural Increase: The balance of births and deaths Rate of Natural Increase 2. Net Migration The balance of in- and out-migration Difference between the in-migration and out-migration of a particular country in one year (can have a positive or negative value) Population Growth = Birth rate Death rate + Net migration
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World Population Growth projected to reach 7 billion in 2012 (U.S. Census Bureau). Reasons: medical advances Substantial increase in agricultural productivity
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Ninth Eighth Seventh Sixth Fifth Fourth Third Second First Billion Number of years to add each billion (year) All of Human History (1800) 130 (1930) 30 (1960) 15 (1975) 12 (1987) 12 (1999) 14 (2013) 14 (2027) 21 (2048) Sources: First and second billion: Population Reference Bureau. Third through ninth billion: United Nations, World Population Prospects: The 2004 Revision (medium scenario), 2005. World Population Growth, in Billions
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World Population Growth, 1950 2050 Source: United Nations Population Division, World Population Prospects, The 2008 Revision . World Population Growth Is Almost Entirely Concentrated in the World's Poorer Countries.
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Population Growth Rate Population growth rate (PGR) Example: United States July 1, 2008 July 1, 2007 Number Percent United States 304,059,724 301,290,332 2,769,392 0.9 . Geographic Area Population Estimates Change, 2007 to 2008
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