GEOL 103 Lecture Notes - Lecture 5: Demographic Transition
Document Summary
The age structure is a distribution of the ages of individuals within a population at a given point in time. More developed regions: pencil, vertical, millions on x, age on y. Less developed regions: half an onion, horizontal, millions on x, age on y. Current world age structure: bigger at bottom, larger decreases in millions upon increase in age, smallest up top. Estimated world age structure: bigger at bottom, smaller decreases in millions upon increase in age, larger upon 80+ age. The theory of demographic transition implies that as a nation undergoes technological and economic development, its population growth rate (birth rate) will decrease. Most developed nations achieved development by degrading their environments and exploring resources from other parts of the world. The earth does not have su cient resources to permit the developing nations to reach the developed nations" level of a uence.
