The Human Population and its Impact Chapter 6 and Chapter 23-4.
Human Population and Its Impact
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Transcript of 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
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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)
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Population Regulated
Agricultural Advances
Range Expansion &Adaptation
SanitationMedical AdvancesIndustrialization
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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
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Tracking the U.S. Baby Boom
Based on this U.S. should be stable
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Is U.S. Population Declining?
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Immigration increases population size
Immigrants adopt resource use habits of new country
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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