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Human population growth
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  • 1. Human Population Growth Dr. Mark A. McGinley Honors College and Department of Biological Sciences Texas Tech University
  • 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. 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. 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. 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. 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. 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. Human Population Growth Problem?• Benefits of Population Growth??• Disadvantages of Population Growth??
  • 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. Where is Human Population Growth Occurring?• Most population growth is occurring in developing countries.
  • 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. Deforestation in Borneo
  • 13. Hunger
  • 14. Food-related Problems?
  • 15. Childhood Obesity in the USA
  • 16. Weight Loss Products • Weight Loss is a 60 Billion Dollar industry in the USA
  • 17. Pudgy Pets
  • 18. Access to Freshwater
  • 19. World Poverty
  • 20. Child Labor
  • 21. Urbanization
  • 22. Urbanization- India Photo by Honey Blakeman
  • 23. Human Population Growth• Human populations have basically stabilized in developed countries but are still increasing in developing nations• Why??
  • 24. Demographic Transition
  • 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. What Causes Per Capita Birth Rates to Decline in Industrialized Societies?
  • 27. Literacy Rate vs. Birth rate
  • 28. Worldwide Literacy
  • 29. Fertility Rate vs GDP
  • 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. Factors Increasing Mortality Rates HIV/AIDS
  • 32. HIV in Africa