The geologic record of climate change is currently a very active area of research. The results of such studies have the potential to greatly improve our understanding of the different factors that influence climate and, consequently, may help to guide policy initiatives regarding global warming. Given the importance of such studies, it is imperative that they be scientifically rigorous and thorough. Friedman (2005) falls short on both counts. In this article, Friedman attempted to use the oxygen isotopic composition of a series of 14C-dated beachrock samples to infer past changes in temperature. On the basis of increasing δ18...

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