text: Debates about those claims revolve around several contentious issues. Key among these are: whether there is, in fact, reason for alarm; what reliable evidence supports that supposition; i.e., what degrees of impact do human have versus natural influences on global temperature changes (both warming and cooling); and what trends can be observed and projected to guide prudent responses? It is not my intent to argue that the global climate has been cooling since the late 1970s, but merely to present a case that there is no convincing evidence that it has been warming.