AP Environmental Science / Unit 3: Populations
3.9 Demographic Transition
Notes
Four stages:
- 1 Preindustrial: high birth and death rates.
- 2 Transitional: death rates fall, births stay high: rapid growth.
- 3 Industrial: birth rates fall.
- 4 Postindustrial: low birth and death rates, stable or declining.
Practice
Rapid growth happens in stage:
Deaths fall first.
Death rates drop in stage 2 mainly because of:
Improved health.
A wealthy country with low birth and death rates is in stage:
Postindustrial.
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