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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. ~10K yr ago – 5 million (start of agriculture) 1927 – reached 2 billion

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Human Population and Its Impact

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  1. 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

  2. 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)

  3. Range Expansion & Adaptation Sanitation Medical Advances Industrialization Agricultural Advances Population Regulated

  4. 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

  5. Tracking the U.S. Baby Boom Based on this U.S. should be stable

  6. Is U.S. Population Declining?

  7. Immigration increases population size Immigrants adopt resource use habits of new country

  8. 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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