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Human Population and Its Impact. Are there too many of us? – Core Case Study p. 122-123 http://www.eahdfoundation.org/world_live_clock.php http://www.census.gov/population/www/popclockus.html. Human Population Growth. ~10K yr ago – 5 million (start of agriculture) 1927 – reached 2 billion

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human population and its impact

Human Population and Its Impact

Are there too many of us? – Core Case Study p. 122-123

http://www.eahdfoundation.org/world_live_clock.php

http://www.census.gov/population/www/popclockus.html

human population growth
Human Population Growth
  • ~10K yr ago – 5 million (start of agriculture)
  • 1927 – reached 2 billion
  • 1974 – another 2 billion (47 yr)
  • 1999 – another 2 billion (25 yr)
slide3

Range Expansion &

Adaptation

Sanitation

Medical Advances

Industrialization

Agricultural Advances

Population Regulated

sources of growth
Sources of Growth
  • Developed countries – 0.1%/yr increase
  • Developing countries – 1.5%/yr increase
  • China & India – 36% global population and rapidly growing economies
  • Changes in birth and death rate
  • Changes in reproductive contribution
tracking the u s baby boom
Tracking the U.S. Baby Boom

Based on this U.S. should be stable

immigration increases population size
Immigration increases population size

Immigrants adopt resource use habits of new country

challenges of slowing population growth china
Challenges of Slowing Population Growth - China
  • Could not support growing population
  • Instituted One-Child Policy – reward if followed it
  • Problem – “little emperors/empresses”, “bride shortage”, kidnappings for brides
  • Solution – allow >1 child if…..
  • Future Problem – age imbalance (31% of population >60 yr old; potential slowing of economy
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