The primary problem is that even the most rabid supporters of the proposed measures of Copenhagen understand and admit that they will do almost nothing to solve the "problem".
From a recent WSJ article:
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So what exactly is the point of Copenhagen? The question needs to be asked all the more insistently in the wake of last month's disclosure of thousands of documents and emails from the University of East Anglia's Climatic Research Unit (CRU), long considered an authoritative center of temperature data, modeling and forecasts.
At a minimum, the emails demonstrate the lengths some of the world's leading climate scientists were prepared to go to manufacture the "consensus" they used to demand drastic steps against global warming. The emails are replete with talk of blacklisting dissenting scientists and journals, manipulating peer review and avoiding freedom of information requests.
Nor can the emails be dismissed as a handful of scientists showing their petulant streak. Scientific research must be subject to testing, verification and, if necessary, disproof. Otherwise, its conclusions are worthless. That's especially true if the basic data on which the climate records are based are deleted, as seems to have been the case with the CRU, or if the elaborate computer models used to forecast climate turn out to be poorly designed, as also seems to be the case.
The core question raised by the emails is why their authors would behave this way if they are as privately convinced of the strength of their case as they claim in public. The Earth's climate is a profoundly complex system, sensitive, dynamic and subject to a dizzying range of variables interacting in ways that remain poorly understood. Carbon dioxide is only one of those variables. Climate scientists failed to anticipate the absence of warming in the last decade, a point that Kevin Trenberth, head of the Climate Analysis Section at the National Center for Atmospheric Research, privately conceded in one of the disclosed emails was a "travesty."
.Given this, the public is entitled to wonder how exactly climate scientists can state with such certainty that temperatures have never been higher, or that they are sure to rise in the coming decade, to say nothing of the rest of the century. The public is also entitled to know how the climatologists can suggest the precise degrees by which the Earth will warm, or why a warmer Earth is, on balance, worse than a colder one. Is there a "correct" global average temperature?
Full text:
Copenhagen, Cap and Trade, and Political Hubris - WSJ.com