1. Humans and Ecology:
What are we doing, what should we do, what can we do, and does it matter?

2. Why are species going extinct?
Fig
55.6
Why are species going extinct?

3. The complex molecules that comprise organisms are based on carbon

4. Fig 54.14
Carbon cycle

5. Solar energy: incoming and outgoing

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

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

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

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

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

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

17. 370

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

19. Effects of global warming are already visible

20. Observed and projected ice cap melting

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

23. Precipitation changes 1900 to 2000

24. Humans and Ecology:
What are we doing, what should we do, what can we do, and does it matter?