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==Hockey Stick Reconstruction==
==Hockey Stick Reconstruction==
One of the main arguments for anthropogenic global warming during the 3rd IPCC report was a temperature reconstruction done by climatologist Michael Mann.
[[Image:Hockey stick chart ipcc.jpg|right|thumb|300px|The Hockey stick graph as shown in the 2001 IPCC report. This chart shows the data from Mann et al. 1999. The colored lines are the reconstructed temperatures, and the gray shaded region represents estimated error bars.
One of the main arguments for anthropogenic global warming during the 3rd IPCC report was a temperature reconstruction done by climatologist Michael Mann. The resulting graph of the earth's mean temperature is shaped like a hockey stick, and it is used as evidence for the unusualness of the earth's temperature in the past few decades. However, serious flaw was later discovered in the statistical methods used to construct the hockey stick graph by Stephen McIntyre and economist Ross McKitrick.
==Natural variability of the climate system==
==Natural variability of the climate system==