human population growth
TRANSCRIPT
![Page 1: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/1.jpg)
Human Population Growth
Dr. Mark A. McGinleyHonors College and Department of Biological
SciencesTexas Tech University
![Page 2: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/2.jpg)
![Page 3: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/3.jpg)
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
![Page 4: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/4.jpg)
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
![Page 5: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/5.jpg)
Approximate EstimatesWorldwide
• 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!!!
![Page 6: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/6.jpg)
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
![Page 7: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/7.jpg)
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%)
![Page 8: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/8.jpg)
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
![Page 9: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/9.jpg)
Human Population Growth Problem?
• Benefits of Population Growth??
• Disadvantages of Population Growth??
![Page 11: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/11.jpg)
Human Numbers Through Time
• http://www.globalchange.umich.edu/globalchange2/current/lectures/human_pop/human_pop.html
•http://www.youtube.com/watch?v=4BbkQiQyaYc
![Page 12: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/12.jpg)
Where is Human Population Growth Occurring?
• Most population growth is occurring in developing countries.
![Page 13: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/13.jpg)
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
![Page 14: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/14.jpg)
Deforestation in Borneo
![Page 15: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/15.jpg)
Hunger
![Page 16: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/16.jpg)
Food-related Problems?
![Page 17: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/17.jpg)
Childhood Obesity in the USA
![Page 18: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/18.jpg)
Weight Loss Products
• Weight Loss is a 60 Billion Dollar industry in the USA
![Page 19: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/19.jpg)
Pudgy Pets
![Page 20: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/20.jpg)
Access to Freshwater
![Page 21: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/21.jpg)
World Poverty
![Page 22: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/22.jpg)
Child Labor
![Page 23: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/23.jpg)
Urbanization
![Page 24: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/24.jpg)
Urbanization- India
Photo by Honey Blakeman
![Page 25: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/25.jpg)
Human Population Growth
• Human populations have basically stabilized in developed countries but are still increasing in developing nations
• Why??
![Page 26: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/26.jpg)
Demographic Transition
![Page 27: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/27.jpg)
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
![Page 28: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/28.jpg)
What Causes Per Capita Birth Rates to Decline in Industrialized Societies?
![Page 29: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/29.jpg)
Literacy Rate vs. Birth rate
![Page 30: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/30.jpg)
Worldwide Literacy
![Page 31: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/31.jpg)
Fertility Rate vs GDP
![Page 32: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/32.jpg)
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?
![Page 33: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/33.jpg)
Factors Increasing Mortality RatesHIV/AIDS
![Page 34: Human population growth](https://reader036.vdocuments.mx/reader036/viewer/2022081516/554f975ab4c90586258b460e/html5/thumbnails/34.jpg)
HIV in Africa