Gerhard (2004) argues that our reasoning on the causes of climate change should be guided by observational science, instead of by results derived from computer models. Given that the nature and balance of the controls of the Earth's climate remain uncertain, this appears to be a sound suggestion. On the strength of his own reading of recent observational science, Gerhard adheres to the view set out by the AAPG Ad Hoc Committee on Global Climate Issues in its 1999 annual report: “Because no tool is available to test the supposition of human-induced climate change and the range of natural variability...

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