world population chapter 4 section 1. over 7 billion number of people on this earth
TRANSCRIPT
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World PopulationChapter 4 Section 1
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Over 7 BillionNumber of people on this Earth
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http://video.nationalgeographic.com/video/the-magazine/the-magazine-latest/ngm-7billion/
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The Demographic Transition
Demography – study of populations
Birthrate vs. Death rate
Natural increase and migration
Transition – use of birth/death rate to demonstrate change in pop.
Falling death rates
Zero population growth – equal birth and death rate
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The Demographic Transition Cont.
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The Demographic Transition Cont.
Birthrates fallen in parts of Asia, Africa, and Latin America
Families having many children – doubling time of growing population
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Challenges of Growth
More people means more need for resources
Food production rose in all continents except Africa
Lack of housing, water or clothing in some places
Uneven age distribution
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Negative Population Growth
Death rate exceeds birthrate
Difficult to find enough people to keep economy going
Importance of immigration
Concentration in metropolitan areas
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Population Density
Number of people per square mile
Canada – low density
Bangladesh – high density
Bolivia vs Dominican Republic – same pop. different land masses
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Population Movement
Urbanization – growth of city populations
Desire to find jobs and better life
Rural population grows but number of farmers doesn’t
Emigration/immigration
Push factors: war, food shortages, ect.
Refugees – fleeing persecution or disasters