Human Population. Demography. Trends in Population. Demography is the study of human populations.
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Approximately 90% of the human population lives on 20% of the Earth’s land area.
The earliest sources of power were ones that we now consider to be desirable because they relied on clean renewable resources. (windmills & hydro dams)
Like the Agricultural Revolution, the Industrial Revolution fundamentally changed the nature of life in many ways…
Death Rate: the number of deaths in a country for every thousand people.
Net Migration Rate: is the difference between the immigration and emigration rates.
Population Growth Rate: is the change in a countries population, combining both the natural increase rate and net migration rate.
Dependency Measures: are used to compare the population in the “dependant ages” (those who need to be housed, fed, educated, etc., for example those under 14 and those over 65) to those in the “working ages” of 15 to 64.
is the ratio of people in the “dependent” ages to those in the “working” ages.
Canada’s 2007 ratio was 45%
Pop. 14 & under + pop. 65 and older ÷ pop. 15 to 64 x 100
The average lifespan of a human at birth.
50- years is low
75+ years is high
Canada’s life expectancy in 2006 was 80 years.
Total Fertility Rate: is the average number of children each woman will have in her fertile years (15-45 years of age).
Rule of 70: is a simple way to estimate how long it would take for a country’s population to double. This excludes migration.