Unit 3 Managing human population

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26 Terms

1
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What’s the formula for population density?

total population/land area

  • # of ppl per km²

2
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What’s the formula for intrinsic growth rate?

dN/N0

  • dN = (births + immigration) - (deaths + emigration)

  • N0 = original population

3
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What is doubling time and its formula?

period of time required for a population to double in size

  • Rule of 70: 70/percent

4
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How can environmental factors impact population density + distribution?

natural resources, geographic & climatic factors

  • Large, flat lowland plains are easier to access + better for food production than mountainous areas

  • Areas w/ few extreme weather events are more appealing

  • Areas w/ fertile soil like river deltas tend to have higher populations than areas with high rainfall (leached soil) & cold areas with permafrost

  • A secure water supply

  • Areas w/ a wealth of natural resources

5
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How can economic factors impact population density + distribution?

  • Agriculture is a primary industry & is manufactured by a secondary industry

    • These increase job opportunities & standard of living, causing population growth

  • Areas w/ good transport links are often more densely populated due to trade links

6
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How can political factors impact population density + distribution?

  • Government policies have an impact on population density

    • Can encourage/discourage investment in an area

    • War is a ‘push’ factor & causes out migration + decrease in food production

7
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How does high infant mortality rates in LICs impact birth rates?

causes high birth rates

  • Due to: spread of disease & lack of both medical care + access to clean water

8
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What’s death rate influenced by?

climate, medical facilities, living standards, & social conflict + crime rates

9
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How does life expectancy increase?

increased standards of living, access to both clean water & nutrition, & education improvements

10
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What’s a Stage 1 population pyramid?

  • (pre-industrial): high birth & death rate w/stable population

    • Rarely found & low life expectancy

<ul><li><p>(pre-industrial): high birth &amp; death rate w/stable population</p><ul><li><p>Rarely found &amp; low life expectancy</p></li></ul></li></ul>
11
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What’s a Stage 2 population pyramid?

  • (transitional): declining death rate (due to medicine, better nutrition, & clean water)

<ul><li><p>(transitional): declining death rate (due to medicine, better nutrition, &amp; clean water)</p></li></ul>
12
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What’s a Stage 3 population pyramid?

  • (industrial): birth rate declines from stage 2, death is still declining/low

    • Less population growth than stage 2; birth rates can typically be controlled by contraceptives

    • Avg. life expectancy increases & mortality rates stabilize

<ul><li><p>(industrial): birth rate declines from stage 2, death is still declining/low</p><ul><li><p>Less population growth than stage 2; birth rates can typically be controlled by contraceptives</p></li><li><p>Avg. life expectancy increases &amp; mortality rates stabilize</p></li></ul></li></ul>
13
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What’s a Stage 4 population pyramid?

  • (late-industrial): low birth & death rates

    • Population size fluctuates due to economic conditions; slow growth

<ul><li><p>(late-industrial): low birth &amp; death rates</p><ul><li><p>Population size fluctuates due to economic conditions; slow growth</p></li></ul></li></ul>
14
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What’s a Stage 5 population pyramid?

  • (post-industrial): birth rate is lower than death rate

    • Older population reaches full life expectancy

<ul><li><p>(post-industrial): birth rate is lower than death rate</p><ul><li><p>Older population reaches full life expectancy</p></li></ul></li></ul>
15
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What’s a dependency ratio?

relationship b/t a country’s working & non-working populations

  • Dependent: ages 0 to 14 (young)& 65+ (old)

  • Independent: age 15-64

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What’s the formula for dependency ratio?

[young population (0 to 14) + old population (65+)] × 100 / population aged 15 to 64

  • Expressed as # of dependents per hundred ppl in the workforce

  • Considered high when it’s above 62%

17
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How can dependency ratio decrease?

  • young population reaching working age

  • anti-natalist policy

  • immigration of working age ppl

  • lower birth rate

18
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What’s an ageing population?

population w/ a high percentage of older people

  • Occur when birth rates decline & life expectancy increases — typically stage 5

  • Average age is increasing due to: better nutrition, sanitation, standard of living, & care

19
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What are some impacts of an ageing population?

  • Shrinking workforce impact economy

  • Pensions may be insufficient to care for older populations - higher spending

  • Health care systems have more pressure since older ppl need more care

  • Increased retirement age, so gov’ts can collect extra taxes

20
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What is the Club of Rome?

aims to alert the world about consequences of a rapidly growing population → focused on sustainable economic growth + limited population growth

21
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What is UN Agenda 21?

plan of action to limit human impact on the environment

22
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What are pro-natalist policies?

encourage ppl to have children & increase birth rates

23
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What are some examples of pro-natalist policies?

  • Shrinking populations pressure a country’s workforce + financial stability

  • Monetary incentives, childcare assistance, free schooling, & monthly grants

24
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What is anti-natalist policy?

discourage ppl from having children & decrease birth rates

25
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What are some examples of anti-natalist policy?

  • Increasing populations that cause declining mortality rates & high rates of poverty

    • e.g) China’s One Child Policy

  • Other policies include:

    • encouraging marriage later in life

    • increasing access to contraceptives & family planning

    • improving education + employment opportunities for women

    • making abortions legal + safe

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What’s a limitation of anti-natalist policy?

Can cause an ageing population + declining workforce