The Debate Surrounding the “Hockey Stick”

1. The Debate Surrounding the “Hockey Stick” Jeremy Krimmel

2. Outline • Introduction • Mann’s Side of the Argument • McKitrick and McIntyre’s Turn • Conclusions/My Opinions

3. Introduction • What is the “Hockey Stick” and where did it come from? • Why is it so important to the overall debate on global warming?

4. Outline • Introduction • Mann’s Side of the Argument • McKitrick and McIntyre’s Turn • Conclusions/My Opinions

5. Mann’s Side of the Argument • Proxy indicators • Multiproxy network

6. Mann’s Side of the Argument • Calibration, or “training” • Three Fundamental Assumptions • Eigenvectors

7. Mann’s Side of the Argument • Conclusions • CO2 only a significant forcing factor in 20th century • CO2 increase caused by greenhouse gases

8. Mann’s Side of the Argument

9. Outline • Introduction • Mann’s Side of the Argument • McKitrick and McIntyre’s Turn • Conclusions/My Opinions

10. McKitrick and McIntyre’s Turn • Mann mined the data for hockey sticks

11. McKitrick and McIntyre’s Turn • Incorrect significance placed on particular data series (bristlecone pines)

12. McKitrick and McIntyre’s Turn • IPCC

13. McKitrick and McIntyre’s Turn • Huang’s Study

14. Outline • Introduction • Mann’s Side of the Argument • McKitrick and McIntyre’s Turn • Conclusions/My Opinions

15. My Conclusions

16. Thank you!