1. Human Population and Its Impact Are there too many of us? – Core Case Study p. 122-123 http://www.eahdfoundation.org/world_live_clo ck.php http://www.census.gov/population/www/popclo ckus.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. Population Regulated Agricultural Advances Range Expansion & Adaptation Sanitation Medical Advances Industrialization

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

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

7. Is U.S. Population Declining?

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

10. 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