1. E11. The level of human population is a biological and ethical issue.

2. A Closer Look 12,000 years 2,000 Years 200 Million by 1 A.D.
1 Billion in 1800 A.D.
The Industrial Revolution
1 Billion
200 million

3. Population Predictions
Most predictions: 9-12B by B by 2100
UN (Low) requires global fertility at less than zero growth in 15 years
Large uncertainties

4. The world’s 10 most populous countries in 2008, with projections of their population sizes in 2025

5. Population density across the world.

6. Absolute population: The size of each country is a comparison of its population to other countries.

7. Change in population due to the development of three major technologies

10. What’s Behind Population Growth
Industrial Revolution
Growth of Cities and Infrastructure
Water
Energy
Transportation
Increased Productivity
Nutrition
Sanitation
Medicine
Three Factors
Fertility
Infant Mortality
Longevity
Animal Domestication and Agriculture
Provided for a few to feed many

11. E11. 1. Explain how the growth of. the human population is
E11.1 Explain how the growth of the human population is placing huge demands on the resources of the biosphere.

12. Population May Overshoot
When Population Outpaces Resources

13. Resource Consumption High consumption Getting worse
Rate increase faster than population growth

14. Our ‘Commons’ are in Danger
Atmospheric pollution and climate change
Water pollution, including ground aquifers
Deforestation and loss of oxygenation
The oceans, coral reefs and their bounty
National parks, wildernesses and wetlands
Standard of living
Use of energy
Nonrenewable natural resource depletion
Fossil fuels, mineral ores, topsoil…..

15. Resource Limits - Land Deforesting to acquire more arable land
Would run out in next century at current yields
Probably need to double yields

16. Resource Limits - Water
In 1950 people used half of accessible water
Are now dependent on dams
Pollution loses 33% of potential water
Getting close to limits

18. Energy Consumption Energy growth very high last fifty years
Mostly hydrocarbon fuels
Nonrenewable resource consumption and climate change issues

19. Unicef: An urban world interactive

20. Predicting the Future - Be Careful
Don’t assume it can’t be done
Leave room for the unknown
Consider alternatives carefully
Pursue all potential solutions

21. E11. 1. Explain how the growth of. the human population is
E11.1 Explain how the growth of the human population is placing huge demands on the resources of the biosphere.

22. The carrying capacity of an ecosystem limits a population

24. Contraception in the developing world
Children later in life
Green movements
Agricultural practices