Geo 143: World Population Growth
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What are some of the characteristics of pre-modern world population growth?
- -Pre-modern (~1750) population growth was so slow.
- -There was no census data before the mid-18th century, so population was estimated based on church, community data and ecological condition(environmental condition + socioeconomic condition and technology available to people)
What are some of the characteristics of modern world population growth?
- -In modern world, there is a dramatic increase in world population.
- -After industrial revolution, population growth accelerated.
- -Now population growth is mostly in less developed countries in global South.
- -Even though natural increase rate is relatively low compared to the 1960s, population numbers added remain high because of population momentum.
Why was pre-modern world population growth so slow and what are the major factors and conditions that precipitated the change in population growth rates?
- -Life expectancy was low, and (children) death rate was very high.
- -High fertility rate, but also high death rate resulted in slow population growth.
- -Cultural practices and the fact that nutrition condition was not good affected the population growth in pre-modern world.
When did the world population growth rate peak and what is the current world population growth rate? (for current world pop growth rate see also World Population Data Sheet)
- -Annual rates of natural increase in world population peaked in 1960s around 2.0%, and since 1971 it has been below 2.0%.
- -current population growth rate is 1.2%.
What are the world population projections for the mid of the 21st century? What are the different scenarios?
- -8.1 billion people (from world population data sheet)
- -From 2010 Revision of population projection to 2100, different scenarios are follows:
- -High fertility(2.5): 10.7 billion people,
- -medium fertility(2.0): 8.9 billion people,
- -low fertility(1.6) 7.3 billion people.
Why do population projections differ?
- -Because it is based on human activities that are unpredictable.
- -Variance of mortality and fertility level make difference in projection scenarios.
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