Mathematical error behind crucial part of Global Warming Claims?
But now a shock: Canadian scientists Stephen McIntyre and Ross McKitrick have uncovered a fundamental mathematical flaw in the computer program that was used to produce the hockey stick. In his original publications of the stick, Mann purported to use a standard method known as principal component analysis, or PCA, to find the dominant features in a set of more than 70 different climate records. . . . .
UPDATE: Nelson Clayton sent me this link to Michael Crichton's speeches where he goes into issues such as the one discussed above. The talks look very interesting. Thanks Nelson.