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AP Enviro



Unit 3

3.9 Demographic Transition

1 min readmay 18, 2020

Harrison Burnside

Karla Jauregui Sandoval

Demographic Transition Model

Diagram Courtesy of Max Roser

Stage 1 ➪ High CBR, High CDR, low growth rate 
Stage 2 ➪ High CBR, lowering CDR, high growth rate 
Stage 3 ➪ lowering CBR, lowering CDR, lowering growth rate 
Stage 4 ➪ low CBR, low CDR, low/negative growth rate 
Pre-industrial Stage 
Transitional Stage 
Industrial Stage 
Post-industrial Stage 
Birth rate is high to compensate for high infant mortality rate. Poorer countries are in this stage.  
Industrialization begins. Access to food and improved healthcare lowers death rate. 
Death rate drops due to improved medicine, and modernization. Mostly developed countries are in this stage.
Birth rate drops to equal zero population growth. If Birth rate falls below death rate than population will decrease 

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Unit 1: The Living World: Ecosystems
Unit 2: The Living World: Biodiversity
Unit 4: Earth Systems and Resources
Unit 5: Land and Water Use
Unit 6: Energy Resources and Consumption
Unit 7: Atmospheric Pollution
Unit 9: Global Change