1. Unit 4: The Biosphere
Human Populations

2. Demography
Study of human population size, density, distribution, movement, and birth/death rates
Module to come next class!
Developed v. Developing countries
Why is the human population increasing more rapidly now than it did in
the past? Inc. life
expectancy due to
Technological
Advances (clean!)
Modern
medicine
I know I am guilty of throwing around these terms loosely.
Developed have higher average incomes, slower population growth, and diverse industrial economies.
Developing have lower incomes, rapid population growth, and simple/agriculture-based economies.

3. Sustainable forever? More to come next class…

4. Age Structure in Human Populations
Number of individuals in age groups
No or negative growth
Used to make predictions based on what communities, countries, etc. might need in the future

6. Yet, Another Graph!
Why the spike? What is significant about it dropping below 2.0? (replacement level)
Must also take immigration/emigration into account!

7. Demographic Transition
Preindustrial – birth and death rate are high (comparatively); population relatively stable (most of the world pre-1700)
Transitional – death rates decline (health), birth rate high; population booms
Industrial – birth rate decreases to near death rate; population stable
Postindustrial – birth rate drops below replacement level; population decreases

8. Most often happens between 1 and 3 generations in developed country

9. Women Have the Power! Birth rates
Less pressure to bear a lot of children – education!
Family
planning

10. Activity (2017) – You Guessed It, Graphing!
Pick a country (approved by Mr. Koons) and take a sheet of computer paper
Four graphs
Population
Age Structure
Survivorship Curve
Birth Rate
At the bottom – make a claim about which stage of the demographic transition your country is in
Things to consider: titles, axis labels, neatness (straight lines when necessary), color!
If time