population © robert j. atkins, ph.d. 1. 2 what are six basic demographic (population) terms?...
TRANSCRIPT
What are six basic demographic (population) terms?Demography
The study of human populationFertility
Amount of childbearing in a population
Several measurements of this
3
Demographic terms (cont.)
Crude birth rateLive births per 1,000 people each
yearHigh income nations e.g. U.S. =
lower than average crude birth rateThe lower the average income, the
higher the population increase
4
Demographic terms (Cont.)
Fecundity rateMaximum possible childbearing
Sex RatioMales for every 100 females
Zero Population growth (ZPG)Two people produce two peopleMaintains population at a steady state
5
What is the world population?
Currently7 Billion
Most of human history the population of the entire earth was 500 Million (1/2 billion)
7
Why do developing nations contribute so much more to the world population?
Something to think about:
8
Why do people have so many children?
Through most of human history:Birth control was not reliableChildren were needed for the farmHigh death rates = many children did
not reach adulthood9
What is the Malthusian theory?
Food increasing arithmeticallyPop. Increasing geometricallyResult : People reproducing beyond
what the planet can supportOut-stripping resourcesPoisoning the planet
10
What is the Malthusian theory?
PopulationFood
Population increases geometrically
Food increases arithmetically
Population could increase beyond what the planet could support
11
What is the Demographic Transition Theory? Population patterns reflect a
society’s level of technological development
From preindustrial (high births & deaths) = slow population growth
To postindustrial (low births & deaths) = slow or stable population growth
Between these two, high birth rate & low death rate = rapidly expanding population
12
Do you remember?
What is the current world population? Why did people have so many children? What is the Malthusian theory? What is the Demographic Transition
theory?
13