The latest debate over global warming focuses on a well-publicised graph depicting temperatures over the past 1,000 years, but some observers argue the graph, which is known as the “hockey stick,” is inaccurate.
Created by Dr. Michael Mann of the University of Virginia, the graph indicates fairly stable temperatures up until the 20th century, and a sharp acceleration over the last century, graphically depicting the shape of a hockey stick.
However, Stephen McIntyre, a minerals consultant from Toronto, first disputed the calculations behind the graph, and his scepticism now has scientists questioning its accuracy as well.
According to McIntyre and other sceptics:
Other researchers, including Mann argue that even if the mathematical method used in producing the graph is a little off, the end results are the same: major global temperature increases are correlated with the 20th century.
However, each side accuses the other of playing politics. McIntyre argues that Kyoto supporters are pushing the hockey-stick graph to further their cause, despite the scepticism that abounds.
Source: Antonio Regalado, In Climate Debate, the ‘Hockey Stick’ Leads to a Face-Off, Wall Street Journal, February 14, 2005.
For text (subscription required): http://online.wsj.com/article/0,,SB110834031507653590,00.html
For more on Global Warming Science: http://eteam.ncpa.org/policy/Global_Warming/Science/
FMF Policy Bulletin/ 22 February 2005
