Are humans evolving?

1. Are humans evolving? Yes sexual selection genetic drift natural selection But humans vigorously oppose natural selection Civilization

2. Read: Human populations Lec 15 2/23/01 Chapter 8

3. Human populations Lec 15 2/23/01 World Population Clock

4. World Population: 6,212,638,147 at 10:15 am today births deaths natural increase each month 10,964,310 4,583,441 6,380,869 each day 360,470 150,688 209,782 each hour 15,020 6,279 8,741 each minute 250 105 146

5. Regional population growth

6. 286,486,673 Regional population growth 5.1% of world’s population increasing 0.6% per year doubling time = 117 years

7. United States Population Picture peaked in 1957 • Baby boom period, following WWII altered age structure of population

9. Baby Boomers • BB encouraged growth of industries needed by young families. • Today these babies are having babies of their own. • People are now living longer. • By 2030, 20% of US pop will be >65

11. US pop. Is still growing 1.1% per year. • 0.6% natural increase • 0.5% immigration • Immigration projected to be 50% of U.S. population growth by 2050

12. 286,486,673 Regional population growth 5.1% of world’s population increasing 0.6% per year doubling time = 117 years

13. Regional population growth 8.44% of world’s population increasing 1.8% per year doubling time = 38 years

14. Regional population growth 12.9% of world’s population increasing 2.5% per year doubling time = 27 years

15. Population Age Structure Diagrams rapid growth slow growth decline

16. Regional population growth 0.5% of world’s population increasing 1.1% per year doubling time = 63 years

17. Regional population growth 12.3% of world’s population decreasing -0.1% per year

18. Fig. 7.1 Regional population growth Death rate has increased 30% since 1992 2.5% of world’s population 10% of newborns have birth defects

19. Regional population growth 60.8% of world’s population increasing 1.5% per year doubling time = 46 years

20. Natality in 1998

21. Natality in 1998

22. Natality in 1998

23. Natality in 1998

24. Natality in 1998

25. Natality in 1998

26. Natality in 1998 2.1 is replacement fertility

28. Longevity

29. Longevity 78

30. Longevity 76

31. 72 for females Longevity 59 for men widest gap

32. Longevity 69

33. Longevity 68

34. Longevity 65

35. Longevity 49

37. MDC = More Developed Countries LDC = Less Developed Countries • Population • Growth rate

39. 96% of world population growth now occurs in developing regions of Africa, Asia, & Latin America 90% of world’s births and 77% of the world’s deaths now occur in the Less Developed Countries

40. refugee children

41. DEMOGRAPHIC TRANSITION • Demographic Transition: Model of population growth based on historical, social, and economic development of Europe and N. America. • High birth and death rates • then • Death rate falls, population grows • then • Industrialization - birth rate falls • Death rates and birth rates equilibrate • Stable population

42. Fig. 8.5

43. Demographic Transition • Comfortable - This is a comfortable model, because it suggests that industrialization will naturally lead to stabilization of the population. • Problem - Can a model developed in Europe and NA be applied to less-developed countries ? Population growth rate is much faster Resources are no longer abundant

44. Hunger, Food Production and Environmental Degradation • As human population grows so does demand for food. • Most people in developed countries purchase their own food. • Most people in less-developed countries must grow their own food. • Destruction of rainforest and natural areas

45. 3 billion people live on less than $2 a day • Poverty breeds plagues war migration AND population increase