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The Hockey Stick Controversy: Analyzing Climate Change and Medieval Warm Period Assertions

This article delves into the contentious debate surrounding the "Hockey Stick" graph by Michael Mann and its implications for our understanding of climate change. It highlights the arguments presented by various climate scientists, including Sir John Houghton and Stephen Schneider, as well as critiques from skeptics like Steve McIntyre and Ross McKitrick. Examining dendroclimatic indicators and temperature reconstructions, this piece calls for a thorough discussion on the validity of recent climate trends compared to historical data, particularly regarding the Medieval Warm Period.

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The Hockey Stick Controversy: Analyzing Climate Change and Medieval Warm Period Assertions

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Presentation Transcript

  1. David Deming

  2. Jonathan Overpeck

  3. “We have to get rid of the Medieval Warm Period”

  4. Michael Mann

  5. Sir John Houghton

  6. Steve McIntyre

  7. Gaspé

  8. Twisted Tree, Heartrot Hill

  9. Ross McKitrick

  10. BACKTO_1400-CENSORED

  11. Ring width 1500 2000 Years AD

  12. Ring width 1500 2000 Years AD

  13. Hockey stick from red noise

  14. Bristlecone pine

  15. “…the long-term trend in [the Northern Hemisphere] is relatively robust to the inclusion of dendroclimatic indicators in the network...”

  16. Caspar Ammann Eugene Wahl

  17. James Saiers Jay Famiglietti Stephen Schneider

  18. Joe Barton Sherwood Boehlert

  19. Edward Wegman

  20. Gerald North

  21. ‘“strip-bark” samples [i.e. bristlecones] should be avoided for temperature reconstructions’

  22. Hockey stick from red noise

  23. “Based on the analyses…by Mann et al. and this newer supporting evidence, the committee finds it plausible that the Northern Hemisphere was warmer during the last few decades of the 20th century than during any comparable period over the preceding millennium.”

  24. “Similar” temperature reconstructions

  25. Climategate

  26. http://bit.ly/9mkvn4

  27. Judith Curry

  28. “I am laying down the gauntlet, this really needs to be discussed and rebutted by the paleo researchers and the IPCC defenders.”

  29. www.bishop-hill.net

  30. ...a rattling good detective story and a detailed and brilliant piece of science writing." Spectator The Hockey Stick Illusion is one of the best science books in years…This book deserves to win prizes. Prospect Andrew Montford tells this detective story in exhilarating style. Geoscientist …a code-breaking adventure, an intriguing detective story, an exposé of a scientific and political travesty… Quadrant

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