1. A Growing World Population

2. Population Curve
For Centuries, Birth and Death Rates were about Equal

3. Three reasons why population has increased since the Industrial Revolution?
Decrease in the Death Rate
Increase in Life Expectancy
Decrease in Infant Mortality

4. Two Changes Made this Possible we can thank science for both
Changes in Agriculture have Increased the World’s food supply
Advances in Medicines, health care and understanding and control of diseases

5. First Big Change: Improvements in Farming & Food
More Food is produced
Improvements in crops
Crops that are better for people – legumes
Use of machines: more crops with fewer people
Use of fertilizers & pesticides
Storage of food

6. Farming in the 1800’s

7. Improvements in Farming

8. The Green Revolution of the 1950’s

9. Fertilizers & Pesticides in the 1950’s

10. Increase in Food output in India

11. Downside of Green Revolution

12. 2nd Big Change: Changes in Health Care
Increase in Life Expectancy
Decrease in Infant Mortality Rate
Decrease In Death Rate

13. Vaccines What is a Vaccine?
A vaccine contains purified fragments taken from killed bacteria or viruses.  Some of the vaccines contain live viruses but in a very weak form that cannot cause the disease.
How does a Vaccine work?
A vaccine "teaches" the immune system how to recognize and fight the bacteria/virus before an infection develops.

14. Changes in Public Services
Better Water and Sewer Systems
Better Support Services – like aid to the poor
Laws that protect workers
Laws that protect the environment

15. Water Treatment Plant

16. Waste Water Treatment Process

17. Both Birth & Death Rates have declined

18. The Developed World Life Expectancy
The Developed Nations have increased Life Expectancy
Changes in living Conditions
Medicines that help people live longer

19. Infant Mortality in the USA

20. Infant mortality has decreased in Developing Nations too

21. Life Expectancy Developing Nations

22. Developing Regions Versus Developed Nation

23. Population Growth Rates

24. Developed & Developing Regions Birth & Death Rates
In the developed world, death rates have declined but birth rates have declined dramatically.
In the developing world, death rates have declined, birth rates are still high.

25. United Nations

26. Most Populous Countries