1. Why is Population Increasing at Different Rates in Different Countries?
Key Issue #3

2. Demographic Transition
Demographic Transition: change in a society’s population; because of diverse local cultural and economic conditions, demographic transition diffuses to individual countries at different rates and produces local variations in natural increase, fertility and mortality
Process of several stages and every country is one of them; beginning, middle, and end
Barring a catastrophe it is irreversible

3. The Demographic Transition
Fig. 2-13: The demographic transition consists of four stages, which move from high birth and death rates, to declines first in death rates then in birth rates, and finally to a stage of low birth and death rates. Population growth is most rapid in the second stage.

4. Stage1 Stage 1: Low Growth Lasted several hundred thousand years
Crude Birth and death rates varied considerably form one year to the next and from one region to another; over long periods of time they were comparable at high levels
NIR was essentially zero
Earth’s population unchanged at somewhere around half a million

5. Stage 1 Hunter and gathers Food easily obtained , population increased
Population decreased when food was scarce
8,000 B.C. population grew by several thousand per year
8000 B.C. to 1750 A.D. population increased from 5 million to 800 million
Caused by agricultural revolution: domestication of plants and animals and no longer relied on hunting and gathering

6. 8000 B.C to 1750 A.D.

7. Stage 1
Created large and more stable food sources; people survived longer
Remained in stage 1 of demographic transition model because food supplies were still unpredictable
Farmers prospered in certain regions with abundant harvests and population grew
Unfavorable climates resulted in low food production, CDR would soar
War and disease took its effects as well in stage 1

8. Stage 2 Stage 2: High Growth
For 10,000 years world grew at a moderate pace
After 1750 grew ten times faster
Occurred in late 18 and 19 centuries because several countries moved into stage 2
CDR plummets(falls because of new technologies), CBR remains same as stage 1, difference in CBR and CDR is high, NIR is high, population grows rapidly

9. Stage 2
2 PARTS:
First Part: period of acceleration
Second Part: growth rate slows, gap between birth and death is high
Countries enter stage because of Industrial Revolution: began in England in 18th Century and spread to the European Continent and North America during the 19th century
Major improvements in technology that transformed how goods were made and the delivering of those to the market; steam engine, mass production, powered transportation

10. Stage 2
Result was unprecedented wealth , some of it made communities better places to live
Wealth improved farming and factory techniques and improved sanitation and hygiene
Sewer systems installed, food and water supplies were protected against containments
People healthier and lived longer
Europe and North America diffused to stage 2 in around 1800; Africa, Asia and Latin America diffused around the 1950s

11. Stage 2
World population grew by 1.7% per year during the second half of 20th century compared 0.5% per year during the nineteenth century
Medical revolution( improved medical technology) that was started in North America and Europe allowed for countries of Africa, Asia, and Latin America to move into stage2 200 years later than Europe and North America
Eliminated many of the diseases that caused deaths in LDC’s
Immunizations to small pox and other disease were developed
Penicillin, vaccines and insecticides effectively and inexpensively controlled infectious diseases like malaria and tuberculosis

12. Stage 3 Stage 3:Moderate Growth
Moves from 2 to 3 when CBR begins to drop sharply
CDR continues to fall in stage 3 but at a much slower rate than in 2
Population still grows because CBR is still higher than CDR
Rate of natural increase is more modest in countries in stage 3 than in 2 because gap between CBR and CDR is narrows

13. Stage 3
European Countries and North America moved into stage 3 during first half of 20th century
Asia and Latin America, more recent years
Much of Africa still in stage 2
CBR changes because of new or different social customs (drops)
Fewer children
Economic changes caused fewer offspring: live cities instead of farms
Urban homes are smaller

14. Stage 4 Stage 4: Low Growth
CBR declines to the point of where it equals the CDR and NIR approaches zero
Zero Population Growth (ZPG)
May occur when CBR is still slightly higher than the CDR, some females die before reaching childbearing years and the number of females in childbearing years can vary
To make up for differences, define ZPG as the TFR that results in a lack of change in the total population over a long term
TFR of 2.1% results in ZPG
Most European countries have reached state 4
United States reached this stage around 2000

15. Stage 4 Social customs help explain stage 4 Women in the labor force
Need child care because both parents work outside of home- before employment and child rearing took place in the home
Wide range of birth-control
Increase income and leisure time, participate in activities and entertainment not suitable for children
Russia has negative NIR more deaths than births
Eastern Europe's high death rates and low birth rates are a legacy of Communist rule
Inadequate pollution control high death rates
Strong family planning lower birth rates
Deep pessimism about having children in a uncertain world

16. Conclusion
A country that has passed through all four stages of the model has in some ways completed a cycle- little or no increase in stage 1, to little or no natural increase in stage 4
Two crucial demographic differences
CBR and CDRs are high 35 to 40 per 1,000 at the beginning stage and at the end the rates are very low 10 per 1,000
Total Population of the country is much higher in stage 4 than in stage 1