1. Today: Global Climate Change

2. Fig 54.14
Carbon cycle

3. Solar energy: incoming and outgoing

5. Sunlight shifts wavelength from short to long

6. CO2 and other greenhouse gases keep heat from radiating back into space

7. CO2 levels in Hawaii and average global temp.
Fig 54.15

9. Gases trapped in ice core bubbles can tell us about past climate conditions.

12. Recent increases in global temperature have reversed a slight cooling trend

13. Vikings in Greenland in the 1200- 1400’s

15. As the climate cooled, the Vikings were forced to abandon their outposts

16. 370

17. Relative contributions to Global Warming
~500 m people
~300 m people
~2.5 b people

18. Effects of global warming are already visible

19. Observed and projected ice cap melting

21. Global Change & Human Health (2001) V 2 # 1 pg 64

22. Precipitation changes 1900 to 2000

23. Next: Who is affected by Global Climate Change