Geography Population Dynamics Part 1

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  • Geography Unit 2 - Population Dynamics Part 1
    • The past present and the future of global population
      • In 1750 the world population was under 1 billion people. It climbed up to 2 billion by 1930
      • By 2011 it had grown to nearly 7 billion.
      • The UN believe that the population is set to increase between 10.6 and 8.1
      • The change of population is difficult to predict because we dont know how birth rates and death rates will change
    • Why does population change?
      • Populations change because of the change in birth rates and death rates
      • Birth rate: The number of people born in every 1000 people per year
      • Death rates: The number of people who die per 1000 of the population each year
      • Life expectancy: The average age at which people die in a population
      • Infant mortality: The number of children who die per 1000 of births each year
      • Fertility rates: The number of children that women have in their lifetime
    • Demographic transition model
      • Stage 1:Poor health care means death rates and birth rates are high
      • Stage 2: An improvement of healthcare means death rates fall but birth rates are still high
      • Stage 3: Social and economic changes mean birth rates begin to fall.
      • Stage 4: Birth rate and Death rate balance which means a stable population
      • Low fertility and very high life expectancy so birth rate falls below death rates


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