1. © 2006 Population Reference Bureau World population growth

2. © 2006 Population Reference Bureau A.D. 2000 A.D. 1000 A.D. 1 1000 B.C. 2000 B.C. 3000 B.C. 4000 B.C. 5000 B.C. 6000 B.C. 7000 B.C. 1+ million years 8 7 6 5 2 1 4 3 Old Stone Age New Stone Age Bronze Age Iron Age Middle Ages Modern Age Black Death—The Plague 9 10 11 12 A.D. 3000 A.D. 4000 A.D. 5000 1800 1900 1950 1975 2000 2100 Future Billions Source: Population Reference Bureau; and United Nations, World Population Projections to 2100 (1998). World Population Growth Through History

3. © 2006 Population Reference Bureau Why is world population growing so fast? Compare life today with conditions 100 years ago: Agriculture Medicine Sanitation Health care Transportation More people reach child-bearing age and have children

4. © 2006 Population Reference Bureau Factors that limit population growth Famine Disease War

5. © 2006 Population Reference Bureau Trends in Population Growth Worldwide Population Increase and Growth Rate, Five-Year Periods Millions Percent increase per year Source: United Nations, World Population Prospects: The 2004 Revision (medium scenario), 2005.

6. © 2006 Population Reference Bureau Billions Less Developed Regions More Developed Regions Source: United Nations, World Population Prospects: The 2004 Revision (medium scenario), 2005. Growth in More, Less Developed Countries

7. © 2006 Population Reference Bureau Africa and Other Developing Regions Make Up an Increasing Share of World Population

8. © 2006 Population Reference Bureau Less developed countries

9. © 2006 Population Reference Bureau More developed countries

10. © 2006 Population Reference Bureau population pyramids: graphically display a population's age and gender composition; are bar graphs; show numbers or proportions of males and females in each age group; show gains of cohort members due to immigration and birth, and loss of cohort members due to emigration and death; and reflect population growth or decline.

11. © 2006 Population Reference Bureau Population Structures by Age and Sex, 2005 Millions Less Developed Regions More Developed Regions MaleFemaleMaleFemale 80+ 75-79 70-74 65-69 60-64 55-59 50-54 45-49 40-44 35-39 30-34 25-29 20-24 15-19 10-14 5-9 0-4 Age Source: United Nations, World Population Prospects: The 2004 Revision, 2005. Age Distribution of the World’s Population

12. © 2006 Population Reference Bureau Less developed countries have significantly younger populations. Almost 1/3 of the population in less developed countries is under age 15. 2 billion young people under age 20 in less developed regions. In contrast, less than 1/5 of the population in more developed countries is under age 15. Notes on Age Distribution of the World’s Population

13. © 2006 Population Reference Bureau Population Demography - The study of size, birth, and death rates, and distribution of humans Adding to a human population: –Birth rate and immigration Subtracting from a human population: –Death rate and emigration Birth rates haven't increased much in our world, but death rates have become much lower in the past century.

14. © 2006 Population Reference Bureau Lowest and Highest Infant Mortality Rates

15. © 2006 Population Reference Bureau