Unit 4: The Biosphere Human Populations

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.

Sustainable forever? More to come next class…

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

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

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

Most often happens between 1 and 3 generations in developed country

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

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