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Human Population Growth       Dr. Mark A. McGinley Honors College and Department of        Biological Sciences       Texas...
Human Population Growth•   Reached 1 Billion – 1830•   Reached 2 Billion – 1930•   Reached 3 Billion – 1960•   Reached 4 B...
Current Estimated Human Population• Monday February 4, 2013  – 1:40 PM• World 7,064,109,760 people• http://www.census.gov/...
Approximate Estimates               Worldwide• 5 births per second• 2 deaths per second• dN/dt = 3 individuals per second•...
Human Population Growth• As human population size has increased there  has not been a decline in the per capita  growth ra...
What’s Up With Humans?• Humans can alter the world in ways that no  other species on the planet can.  – 1. increase food p...
What’s Up With Humans?– 2. Modern medicine   • Decreased juvenile mortality   • Increased longevity– 3. Better public heal...
Human Population Growth Problem?• Benefits of Population Growth??• Disadvantages of Population Growth??
Human Numbers Through Time• http://www.globalchange.umich.edu/globalch  ange2/current/lectures/human_pop/human_  pop.html•...
Where is Human Population Growth            Occurring?• Most population growth is occurring in  developing countries.
Potential Problems With High Human   Population Growth Occurring in         Developing Countries• Environmental problems  ...
Deforestation in Borneo
Hunger
Food-related Problems?
Childhood Obesity in the USA
Weight Loss Products          • Weight Loss is a 60            Billion Dollar            industry in the USA
Pudgy Pets
Access to Freshwater
World Poverty
Child Labor
Urbanization
Urbanization- India  Photo by Honey Blakeman
Human Population Growth• Human populations have basically stabilized in  developed countries but are still increasing in  ...
Demographic Transition
Demographic Transition• Pre-industrial societies   – High per capita death rates offset by high per capita     birth rates...
What Causes Per Capita Birth Rates to Decline in Industrialized Societies?
Literacy Rate vs. Birth rate
Worldwide Literacy
Fertility Rate vs GDP
What Will Happen to Human    Population Size in the Future???• Human demographers predict that once all  countries have co...
Factors Increasing Mortality Rates             HIV/AIDS
HIV in Africa
Human population growth
Human population growth
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Human population growth

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Transcript of "Human population growth"

  1. 1. Human Population Growth Dr. Mark A. McGinley Honors College and Department of Biological Sciences Texas Tech University
  2. 2. Human Population Growth• Reached 1 Billion – 1830• Reached 2 Billion – 1930• Reached 3 Billion – 1960• Reached 4 Billion – 1975• Reached 5 Billion – 1987• Reached 6 Billion – 1999• Reached 7 Billion – 2011
  3. 3. Current Estimated Human Population• Monday February 4, 2013 – 1:40 PM• World 7,064,109,760 people• http://www.census.gov/main/www/popclock. html
  4. 4. Approximate Estimates Worldwide• 5 births per second• 2 deaths per second• dN/dt = 3 individuals per second• = 10,800 inviduals per hour• Add new Lubbock (N = 230,000 ind) in less than 1 day!!!
  5. 5. Human Population Growth• As human population size has increased there has not been a decline in the per capita growth rate – As populations have gotten larger humans have not been forced to have lower per capita birth rates – As populations have gotten larger humans have not been forced to have higher per capita death rates
  6. 6. What’s Up With Humans?• Humans can alter the world in ways that no other species on the planet can. – 1. increase food production • Agriculture – Irrigation, fertilization, farm more area, mechanization, crop improvement • Interestingly, the proportion of people who are starving on the planet is about the same to day as it was in the mid 1800s (20%)
  7. 7. What’s Up With Humans?– 2. Modern medicine • Decreased juvenile mortality • Increased longevity– 3. Better public health • Waste disposal • Clean water– 4. Don’t worry too much about predators • Occasional shark or cougar attack
  8. 8. Human Population Growth Problem?• Benefits of Population Growth??• Disadvantages of Population Growth??
  9. 9. Human Numbers Through Time• http://www.globalchange.umich.edu/globalch ange2/current/lectures/human_pop/human_ pop.html• http://www.youtube.com/watch?v=4BbkQiQy aYc
  10. 10. Where is Human Population Growth Occurring?• Most population growth is occurring in developing countries.
  11. 11. Potential Problems With High Human Population Growth Occurring in Developing Countries• Environmental problems – Most developing countries located in the tropical regions – Habitat destruction, overharvesting, and pollution can cause extinction in the two most diverse ecosystems on the Earth • Tropical Rainforests • Coral Reefs
  12. 12. Deforestation in Borneo
  13. 13. Hunger
  14. 14. Food-related Problems?
  15. 15. Childhood Obesity in the USA
  16. 16. Weight Loss Products • Weight Loss is a 60 Billion Dollar industry in the USA
  17. 17. Pudgy Pets
  18. 18. Access to Freshwater
  19. 19. World Poverty
  20. 20. Child Labor
  21. 21. Urbanization
  22. 22. Urbanization- India Photo by Honey Blakeman
  23. 23. Human Population Growth• Human populations have basically stabilized in developed countries but are still increasing in developing nations• Why??
  24. 24. Demographic Transition
  25. 25. Demographic Transition• Pre-industrial societies – High per capita death rates offset by high per capita birth rates • Slow population growth• Transitional societies – Per capita birth rates have remained high while per capita death rates have fallen • Rapid population growth• Post-industrial societies – Low per capita death rates and per capita birth rates • Slow population growth
  26. 26. What Causes Per Capita Birth Rates to Decline in Industrialized Societies?
  27. 27. Literacy Rate vs. Birth rate
  28. 28. Worldwide Literacy
  29. 29. Fertility Rate vs GDP
  30. 30. What Will Happen to Human Population Size in the Future???• Human demographers predict that once all countries have completed the demographic transition that Earth’s population will stabilize. – When and how large?
  31. 31. Factors Increasing Mortality Rates HIV/AIDS
  32. 32. HIV in Africa
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