Notes from a climate-change “denier”:

Gradually I have found myself more impressed with the arguments of the climate change skeptics–the reviled “deniers”–than with the Michael Mann school of hockey stickology or the IPCC striptease in which it discards its pretences to “settled science” a glove at a time without ever getting down to bare truth.

…In my own field, anthropology, I have lived through the replacement of “consensus” on the idea that the makers of the so-called Clovis spear points, which go back 13,500 years, were the first Native Americans. The “Clovis First” theory always had doubters but it dominated from the 1930s until 1999, when archaeologists in large numbers accepted the evidence of older populations. Likewise, there was a long-established consensus that Neanderthal and modern Homo Sapiens did not successfully interbreed–though here too there were always some dissenters. We now know for a certainty (based on the successful sequencing of the Neanderthal genome) that our species did indeed mix, and modern Europeans carry a percent or two of Neanderthal genes.

In time, scientific controversies get resolved, often by the emergence of new kinds of evidence that no one originally imagined. Views that are maintained, to some degree, by a wall of artificial “consensus” die hard. That, of course, was one of the lessons of Thomas Kuhn’s The Structure of Scientific Revolutions (1962), which inaugurated the long vogue for the word “paradigm” to describe a broadly accepted theory. Kuhn’s work has often served as a warrant for those who see science as a social project amenable to political manipulation rather than an intellectual endeavor with strict standards of evidence and built-in mechanisms for correcting mistakes.

Thus when the “anthropogenic global warming” (AGW) folks insist that they command a “consensus” of climate scientists, they fully understand that they are engaged in a political act. They intend to summon the social and political dynamics that will create a “consensus,” by defining the skeptics as a disreputable minority that need not even be counted. It is a big gamble since a substantial number of the skeptics are themselves well-established and highly respected scientists, such as MIT’s Richard Lindzen, Princeton’s Will Happer, and Institute of Advanced Studies’ Freeman Dyson. But conjuring a new “paradigm” out of highly ambiguous data run through simulation computer models is tricky business and isn’t likely to produce a “consensus” all on its own.

No, it always needs help from demagogues with an agenda.