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Statistical Analysis Does not Support a Human Influence on Climate

Wigley et al. [1998] have suggested a novel statistical approach for detecting an anthropogenic influence on climate. Their claim is based on the difference they find between the autocorrelation of the (observed) temperature record and that of an unforced climate model (i.e., one in which greenhouse-gas levels do not rise). We examine their analysis in greater detail and find that their conclusion is not valid.