1. Global Climate Change Overview Michael D. Mastrandrea, Ph.D. Deputy Director, Science, IPCC Working Group II and Assistant Consulting Professor Woods Institute for the Environment

2. Global climate change is… unequivocal, almost certainly caused mostly by us, already causing significant harm growing rapidly, and requires global action and local solutions. The Key Facts

3. http://data.giss.nasa.gov/gistemp/graphs/ Warming is Unequivocal…

4. J. Hansen et al., PNAS 103: 14288-293 ( 2006) …And Not Uniform Average Surface T in 2001-2005 vs 1951-80

5. Muir Glacier, Alaska NSIDC/WDC for Glaciology, Boulder, compiler. 2002, updated 2006. Online glacier photograph database. Boulder, CO: National Snow and Ice Data Center. August 1941August 2004 Shrinking Glaciers

6. 19922002 2005 Source: ACIA, 2004, CIRES, 2005, Roger Braithwaite, University of Manchester (UK) Surface melting on Greenland is expanding

7. Changing Patterns of Extreme Events Major floods per decade, 1950-2000

8. Source: Westerling et al. 2006 Western US area burned Increasing Wildfire Risk

9. Natural Carbon Cycle

10. Human Impact on the Carbon Cycle

11. LAND ATMOSPHERE 750 Gt C 379 ppm CO 2 OCEANS emissions from terrestrial systems 100 Gt C per year absorption by terrestrial systems 103 Gt C per year emissions from marine systems 100 Gt C per year absorption by marine systems 102 Gt C per year human-caused emissions: 9 Gt C per year Carbon Flows (2005)

12. Increasing CO 2 Concentrations

13. IPCC, 2007

14. Increasing CO 2 Concentrations

15. Ice Core Records

16. Source: Hansen, Clim. Change, 68, 269, 2005. Ice Core Records

17. IPCC, 2007 Black = Observed Gold = Human and Natural Forcings Blue = Only Natural Forcings Fingerprint Analysis

18. UCS Projected Changes in CA Summer Temperature

19. 2004 >9,500 ft 1900 >7,800 ft Pika Species Shifting and…

20. Diminishing Sierra Snowpack Percentage Remaining, Relative to 1961-1990 UCS

21. Mitigation Adaptation

22. Raupach et al. 2007, PNAS 2006 2005 Rapidly Increasing Emissions

23. Climate Stabilization

24. Raupach et al., 2007 Regional CO 2 Emissions 2004 2000-2004 Growth