1. Age Structure Diagrams
Show the proportion of the population at each age level
Three main age categories:
Prereproductive (ages 0-14)
Reproductive (15-44)
Postreproductive (45+)

2. Age Structure Diagrams

4. Baby-Boom Generations
How can Age Structure Diagrams be used to make population and economic projections?
Baby-Boom Generations
Creates social and economic changes that ripple through a society for decades
Competition for jobs; political clout; retirement benefits and needs

5. What are the effects of population decline?
Rapid pop. decline can lead to severe economic and social problems
A sharp rise in proportion of elderly will lead to a large share of medical care, social security and other costly social services
Labor shortages

6. Human Population Dynamics
World Population (7 min)

7. Human Population History

8. Estimated Human Population Growth

9. Limits to Growth How do we estimate carrying capacity for a species?
Examine requirements of given species
Examine resources available to given species
For Humans….
How deep is the barrel?

10. Limits to Growth Why is this difficult to estimate for humans?
Range of resources used is too great (MEDC vs LEDC)
Resource requirements vary according to lifestyles
Resource requirements differ from time to time and population to population
When a resource becomes limiting, we show great ingenuity in substituting one resource for another
Technological developments give rise to continual changes in the resources required and available for consumption

11. Limits to Growth
So what factors are used to determine human carrying capacity?
Rate of energy and material consumption
Level of pollution
Extent of human interference in global life-support systems
Affect reuse and recycling have on reducing these impacts/increasing carrying capacity