Human population and its impact
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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

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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)


Human population and its impact

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


Is u s population declining

Is U.S. Population Declining?


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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