population. part 1: where is everyone? what is population distribution?
TRANSCRIPT
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Population
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Population
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Part 1: Where is everyone?
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What is population distribution?
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“Population distributions are descriptions of locations on the Earth’s surface where individuals or groups live.”
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Two-thirds of the World’s Population is concentrated in four specific areas.
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East Asia
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South Asia
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Southeast Asia
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Europe
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What is ecumene?
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“Ecumene is the portion of the Earth’s surface occupied
by permanent human settlement.”
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How do you measure population?
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“Population Density is the number of people occupying
an area of land.”
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What inferences can you make by looking at countries with a high percentage of arable land but a low agricultural density?
What inferences can you make about a country with a high physiological density but a low arithmetic density?
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Part 2: Where has the World’s population increased?
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How do you measure population change?
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“You can measure population change through the Crude
Birth Rate, the Crude Death Rate, and the Natural
Increase Rate.”
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The Crude Birth Rate (CBR) is the total number of live births a year for every
1,000 people alive in the society.
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The Crude Death Rate (CDR) is the total number of deaths a year for every 1,000 people alive in the society.
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The Natural Increase Rate (NIR) is the percentage by which a population
grows in a year.
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NIR = (Crude birth rate − Crude death rate) / 10
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2.992% = (37.89 − 7.97) / 10
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The Total Fertility Rate(TFR) is the average number of children a woman
will have during her childbearing years.
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The Infant Mortality Rate (IMR) is the annual number of deaths of infants under 1 year
compared with total live births.
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Life Expectancy measures the average number of years a newborn can expect to
live at current morbidity levels.
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Part 3: Why is population increasing at different rates?
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What is a population pyramid?
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“A population pyramid is a graphical illustration that shows the
distribution of various age groups as well as the sex ratio, the number of males per hundred females and the
dependency ratio, the number of people who are too old or too
young to work.
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What is a model?
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“A model attempts to explain or demonstrate why something exists
the way it does. “
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What is the demographic
transition model?
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“The demographic transition model explains the transition from high birth and death rates to low birth
and death rates as a country develops from a pre-industrial to an
industrialized economic system.
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Stage 1: Low Growth
1.People depended on hunting and gathering for food.
2.Most of human history spent during this stage.
3.The NIR is essentially zero.4.There is no country still in stage 1.
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1. Brought about by the Industrial Revolution.2. CDR Plummets while the CBR remains the same
as in stage 1.3. Allowed to spread to LDRs by the medical
revolution (20th century)
Stage 2: High Growth
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1. Brought about by cultural changes.2. Characterized by a sudden drop in the CBR.3. There is still growth but not as fast as in Stage 2
Stage 3: Moderate Growth
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1. The CBR = CDR2. Zero Population Growth3. Low TFR
Stage 4: Moderate Growth
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1.Though not official, some say that there is a Stage Five.
2.In stage five, CDR is greater than CBR largely because of an aging population.
3.The NIR is below Zero.4. Much of Europe is entering this stage.
Stage 5: Negative Growth
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Part 4: Overpopulation?
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Thomas Malthus
My theory is that population is growing too rapidly because while population increases geometrically,
food supply increases arithmetically.
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Thomas Malthus’ Theory
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Malthus Supporters:
• Malthus’ theory did not take into account the rapid growth of LDCs.
• World population is not just stripping food but a lot of other resources as well.
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Malthus Critics:
• His theory is based on a belief that the world’s supply is fixed rather than expanding.
• A larger population could stimulate economic growth to produce greater resources.
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The Reality of Population Growth
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Food is increasing more rapidly than predicted by Malthus.
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Birth rates are declining.
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Why are birth rates declining?
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How do governments affect population?
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What is the difference between expansive and restrictive population
policies??
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“Expansive population policies encourage large families.
Restrictive population policies seek to reduce the rate of natural
increase.”
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How does disease affect population?
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What is the Epidemiologic
Transition Model?
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“The Epidemiologic Transition Model focuses on distinctive causes
of death in each stage of the demographic transition.”
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What is the largest epidemic of our time?
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