The climate changes for a number of reasons, not just a c or two. There are other greenhouse gases, methane nitrous oxide being the most important ones. The climate does vary on its own, and you've got to somehow take that into account. Even for a given amount of greenhouse gases and air sauts, the models respond in very different ways. Some warm by only one degree when you double carbon dioxide, one and a half,. Others warm by five or six degrees.

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