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Chapter 9

Chapter 9. Applying Population Ecology: The Human Population and Its Impact. Is the World Overpopulated?.

wade-fulton
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Chapter 9

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  1. Chapter 9 Applying Population Ecology: The Human Population and Its Impact

  2. Is the World Overpopulated? • Much of the world’s population growth occurs in developing countries like China and India. The world’s population is projected to increase from 6.6 billion to 8.9 billion between 2006 and 2050. Figure 9-1

  3. HUMAN POPULATION GROWTH:A BRIEF HISTORY • The human population has grown rapidly because of the expansion of agriculture and industrial production and lower death rates from improvements in hygiene and medicine. • In 2006, the population of developed countries grew exponentially at 0.1% per year. • Developing countries grew (15 times faster at 1.5% per year.

  4. The nations that will experience the most growth over the next 50 years , in order: India China Pakistan Nigeria Bangladesh Indonesia 5 most populated countries, in order: (2004) China India U.S. Indonesia Brazil Demographic Facts:

  5. Where Are We Headed? • U.N. world population projection based on women having an average of 2.5 (high), 2.0 (medium), or 1.5 (low) children. Figure 9-2

  6. Declining Fertility Rates: Fewer Babies per Woman • The average number of children that a woman bears has dropped sharply. • This decline is not low enough to stabilize the world’s population in the near future. • Replacement-level fertility: the number of children a couple must bear to replace themselves. • Total fertility rate (TFR): the average number of children a woman has during her reproductive years.

  7. Fertility Rates • The replacement level to sustain a population is 2.1 children. • In 2006, the average global Total Fertility Rate was 2.7 children per woman. • 1.6 in developed countries (down from 2.5 in 1950). • 3.0 in developing countries (down from 6.5 in 1950).

  8. Fertility and Birth Rates in U.S. • Nearly 2.9 million people were added to the U.S. in 2006: • 59% occurred because of births outnumbering deaths. • 41% came from illegal and legal immigration. • total fertility rate in the United States was slightly > 2.0

  9. Fertility and Birth Rates in U.S. • The baby bust that followed the baby boom was largely due to delayed marriage, contraception, and abortion. Figure 9-6

  10. 47 years Life expectancy 77 years 8% Married women working outside the home 81% 15% High school graduates 83% 1900 vs. 2000 10% Homes with flush toilets 98% 2% Homes with electricity 99% 10% Living in suburbs 52% 1900 Hourly manufacturing job wage (adjusted for inflation) $3 2000 $15 1.2 Homicides per 100,000 people 5.8 Fig. 9-7, p. 176

  11. Factors Affecting Birth Rates and Fertility Rates • The number of children women have is affected by: • 1) The cost of raising and educating them. • 2) Availability of pensions. • 3) Urbanization. • 4) Education and employment opportunities (the importance of child and/or woman as part of labor force). • 5) Infant deaths. • 6) Marriage age. • 7) Availability of contraception and abortion.

  12. Factors Affecting Death Rates • Death rates have declined because of: • 1) Increased food supplies, better nutrition. • 2) Advances in medicine. • 3) Improved sanitation and personal hygiene. • 4) Safer water supplies. • U.S. infant mortality is higher than it could be (ranked 46th world-wide) due to: • 1) Inadequate pre- and post-natal care for poor. • 2) Drug addiction. • 3) High teenage birth rate.

  13. POPULATION AGE STRUCTURE • Populations with a large proportion of its people in the preproductive ages (1-14) have a large potential for rapid population growth. Figure 9-9

  14. POPULATION AGE STRUCTURE • 32% of the people in developing countries were under 15 years old in 2006 versus only 17% in developed countries. Figure 9-10

  15. POPULATION AGE STRUCTURE • Today, baby boomers make up nearly half of all adult Americans and dominate the populations demand for goods and services. Figure 9-11

  16. INFLUENCING POPULATION SIZE • Demographic Transition: As countries become economically developed, their birth and death rates tend to decline. • Preindustrial stage: little population growth due to high infant mortality. • Transitional stage: industrialization begins, death rates drops and birth rates remain high. • Industrial stage: birth rate drops and approaches death rate. • Post-industrial stage: birth rates continue to drop – may enter negative population growth

  17. Demographic Transition Model 1 Preindustrial 2 Transitional 3 Industrial 4 Post- industrial

  18. SOLUTIONS: INFLUENCING POPULATION SIZE • Women tend to have fewer children if they are: • Educated. • Hold a paying job outside the home. • Do not have their human rights suppressed. • The best way to slow population growth is a combination of: • Investing in family planning. • Reducing poverty. • Elevating the status of women.

  19. GROWTH IN INDIA AND CHINA • For more than five decades, India has tried to control its population growth with only modest success. • Since 1970, China has used a government-enforced program to cut its birth rate in half and sharply reduce its fertility rate.

  20. Percentage of world population India 17% China 20% 1.1 billion Population 1.3 billion 1.4 billion Population (2050) (estimated) 1.6 billion 47% Illiteracy (% of adults) 17% 36% Population under age 15 (%) 20% 1.6% Population growth rate (%) 0.6% 2.9 children per women (down from 5.3 in 1970) Total fertility rate 1.6 children per women (down from 5.7 in 1972) 58 Infant mortality rate 27 62 years Life expectancy 70 years Percentage living below $2 per day 80 47 $3,120 GDP PPP per capita $5,890 Fig. 9-15, p. 186

  21. India’s Failed Family Planning Program • Poor planning. • Bureaucratic inefficiency. • Low status of women. • Extreme poverty. • Lack of administrative financial support. • Disagreement over the best ways to slow population growth.

  22. China’s Family Planning Program • Currently, China’s TFR is 1.6 children per women. • China has moved 300 million people out of poverty. • Economic incentives, free medical care, & preferential treatment has helped. • Problems: • Strong male preference leads to gender imbalance. • Average population age is increasing.

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