The Debate Surrounding the “Hockey Stick” Jeremy Krimmel

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

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

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

Mann’s Side of the Argument Proxy indicators Multiproxy network

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

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

Mann’s Side of the Argument

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

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

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

McKitrick and McIntyre’s Turn IPCC

McKitrick and McIntyre’s Turn Huang’s Study

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

My Conclusions

Thank you!