One of the many crimes that climate scientists have been accused of lately is that they claim absolute certainty in a field of research fraught with uncertainty. Sure, the planet is warming, say skeptics, but that's happened throughout Earth's history, long before humans were burning fossil fuels. So, how can we be sure this isn't just a natural phenomenon?
Yet a search through the much vilified Intergovernmental Panel on Climate Change (IPCC) reports shows that absolute certainty is notably absent. In the most recent document, for example, published in 2007, the authors write: "Most of the observed increase in global average temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic GHG [that is, human-generated greenhouse gas] concentrations."
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