Population Growth - Winston-Salem/Forsyth County Schools
The Human Population
Human Population Growth
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Figure 1: Human Population Growth over Time
Factors affecting human population:
Fertility: Births
Total Fertility: Average number of children a woman has (developing world as high as 6.8; developed world as low and < 1)
TFR worldwide 1960: 5 2012: 2.5
Replacement Level Fertility: number of children a couple has in order to replace themselves (theoretically: 2 for 2)
Developed World: 2.1
Developing World: 2.5 – 3.3 (
Mortality: Deaths
Infant Mortality Rate: number of babies that die before their 1st birthday
Life Expectancy: average number of years an infant can expect to live
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Fertility Rate and Overpopulation and Poverty…
Demographics: Population Pyramids or Age Structure Diagrams
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Demographic Transition: Process that has occurred during the last century, leading to a stabilization of population growth in more highly developed countries.
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BIRTH RATE DEATH RATE Pop. Growth
Stage 1: HIGH HIGH SLOW
Stage 2: HIGH DECLINING RAPID
Stage 3: DECLINING DECLINING SLOWING DOWN
Stage 4: LOW LOW ZPG/NEGATIVE
Projected future growth curve
(most closely resembles an “S” shaped curve)
Click on image to enlarge
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Figure 7: Projected World Population Growth
The AIDS factor…
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Figure 8.
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