Population - Human population growth: scientific...

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Human population growth: scientific predictions, influence on resources, environment and incidence of malnutrition Demographic Factors Influencing Demand for Food
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Facts and Figures World POPClock Projection According to the International Programs Center , U.S. Census Bureau, the total population of the World, projected to Apr 9, 2010 is 6,813,759,237 Most populated countries China: 1,338,612,968 (July 2009 est.) India: 1,166,079,217 (July 2009 est.) US: 309,033,422 (4/9/10)
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Facts and Figures Per year: 130 million births, 56 million deaths, increase 74 million people (update, 10/09: 76 million) Per second: 4.1 births, 1.8 deaths, increase of 2.3
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US population According to the U.S. Bureau of the Census, the resident population of the United States, projected to 4/9/10 is 309,033,422 One birth every 8 seconds One death every 12 seconds One international migrant (net) every 26 seconds Net gain of one person every 11 seconds https://www.cia.gov/library/publications/the-world
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Age Structure a reflection of the underlying demographic conditions of the preceding decades at the same time is an important determinant of future demographic patterns. Age structure is important to policy makers due to its impact on two things: Momentum in population growth Dependency ratios
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Population Pyramids a convenient way to visualize age structure and sex of population Population pyramids represent age cohorts by 5- or 10-year intervals youngest cohort is at bottom They place males on left and females on right The graphic presentation of age cohorts can be either actual numbers or percentage distribution
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Population Pyramids They can be used to make comparisons from one country to another They can be used to make comparisons from one time period to another within a country
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US Population, 2000
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US Population, 2025
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US Population,2050
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Niger Population, 2000
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Niger Population, 2025
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Niger Population, 2050
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Momentum in population growth Over long period, population would just reproduce itself if individual couples produced exactly the right number of children to replace themselves, allowing for some children to die before childbearing age Replacement Rate : In developed countries, this number is just over two children (2.1 children/woman exactly)
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Dependency ratios Ratio of dependents to working age adult
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This note was uploaded on 09/08/2010 for the course NUFS 139 at San Jose State University .

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Population - Human population growth: scientific...

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