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Published byCarmen Dennington Modified over 9 years ago
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Human Population Dynamics
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US –310,241,523 (Net gain of 1 person every 11 seconds) World –6,868,672,761 Current Population
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2000 years ago Historical Population Sizes
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World Population Distribution
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World Population Density
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Historical Population Sizes
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Historical Population Changes 3 surges in population –Tools and fire –Agricultural Revolution –Industrial and Medical Revolution
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Rapid growth in past ~100 years due to decrease in death rate –Increased nutrition (more food, better distribution) –Improvements in medical technology –Improvements in sanitation and personal hygiene –Safer water supplies Recent Population Changes
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Change = (crude birth rate + immigration) – (crude death rate + emigration) % change = (crude birth rate - crude death rate)/10 Current world growth rate = 1.1% –Increase of 76 million per year Population Change
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High income, highly developed Middle income, moderately developed (upper & lower) Low income, developing Different Worlds
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Putting it in Perspective
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Replacement Level Fertility (RLF) –Couple has enough children to replace themselves –RLF = 2.1 required to replace each generation Total Fertility Rate (TFR) –Total number of children a woman will have in her life Fertility Rates
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CountryTFRDoubling Time (years) World2.854 Developing Countries3.144 Niger7.523 Brazil2.254 Developed Countries1.6700 US2.0117 Germany1.7--- Fertility Rates
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What if TFR < 2.1? –Population decline –Population aging In US, 66% of growth by 2050 from immigrants and their descendants Fertility Rates
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Growth rate has decreased However, population still increasing - rapidly Growth Rate
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950 CE to 1600650 years 1600 to 1800200 years 1800 to 1925125 years 1925 to 197550 years 1975 to 202550 years Doubling Time
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If a population has a growth rate of 2.0%, what is its doubling time? If a population has a doubling time of 14 years, what is its growth rate? Calculating Doubling Time
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Population Projection
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Population Profiles
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Demographic Transition Process occurring during last ~100 years Stabilization of population growth in highly developed nations
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Factors influencing transition 1. 2. 3. Demographic Transition
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Phase I –Common Characteristics? –NET RESULT = Countries? –Brazilian tribes?
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Demographic Transition Phase II –Common Characteristics? –NET RESULT = ex. Nepal, Afghanistan, Sub-Sahara Africa –Niger –Burundi –Tanzania
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Demographic Transition Phase III –Common Characteristics? –NET RESULT = Ex. China
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Demographic Transition Phase IV –Common Characteristics? –NET RESULT = Ex: US, England
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Phase V? –Characteristics? –Consequences? Ex: Japan, Germany Demographic Transition
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