1. Human Population Growth
Brain Pop Movie
And
Quiz!

2. Human Population Trends Historical Perspective
Limiting Factors
Scarce Food
Incurable Diseases
Only ½ the Children in the World Survived to Adulthood
Therefore families had many children to ensure some would survive.

3. History of Human Population Trends
Source: Glencoe, Biology, 2009

4. History of Human Population Trends cont’d
Source: Glencoe, Biology, 2009

5. Human Population Trends
Human population tends to increase with time.
500 years ago a shift to rapid growth.
Agriculture and Industry
Reliable Food Supply
Shipping
Improved Sanitation
Healthcare
All decreasing the death rate and increasing life expectancy.

6. Source: Glencoe, Biology, 2009.

7. Increase in Human Population Growth Over Time
(Prentice Hall, Biology, 2003)

8. Source: Glencoe, Biology, 2009.

9. Patterns of Population Growth
Demography
Scientific study of human population growth.
What factors do scientists need to take into consideration to predict population growth?
Birthrates
Death Rates
Age Structure

10. Demographic Transition
Dramatic change in birth and death rates
As countries become developed there is a shift in birth rate and death rate
What is happening in the graph?

11. Demographic Transition Cont.
Transition is complete when the birthrate falls to meet the death rate.
Zero Population Growth
What countries have undergone demographic transition? US
Europe
Japan

12. Population Growth Rates of Countries
Source: Glencoe, Biology, 2009.

13. Predicting Population Growth
Age-structure diagrams
Graphs numbers of people in different age groups in the population
How could this help Biologists predict population growth?

14. Interpreting Age-Structure Diagrams

15. Pre-Reproductive, Reproductive, and Post-Reproductive Classifications
Source: Glencoe, Biology, 2009.

16. Developed Vs. Underdeveloped Country
What are the characteristics of each country?
Developed
Underdeveloped

17. Human Carrying Capacity
Estimated to be around 8-10 billion people
Threat of disease and starvation once reached
Technology has temporarily increased human carrying capacity
FOOD FOR THOUGHT ACTIVITY
Source: Glencoe, Biology, 2009

21. Graphic Sources http://www.coremedicalgroup.com/pix/scrubs_lg.jpg