Climate change? We dunno...

Pachauri admits the IPCC just guesses the numbers

Such is the pressure finally beginning to bear on the IPCC that Pachauri has been forced into the ridiculous position of trying to rescue credibility by contradicting most of their past PR campaign. He’s taken the extraordinary step of admitting they don’t have hard numbers, hey, but it’s all OK because the IPCC is really a government agency to make policy, not to write scientific reports “that don’t see the light of day”.

So he’s admitting that the IPCC was all about policy prescriptions all along? And the science was just fudged-up window dressing to provide an excuse? Well, who would have guessed.

Hidden beside Pachauri’s declaration that he’s happy about the IAC report, he let slip a corker of a line:

Times of India asks: Anything in the UN probe report you completely or partly disagree with?

They have talked about quantifying uncertainties. To some extent, we are doing that, though not perfectly. But the issue is that in some cases, you really don’t have a quantitative base by which you can attach a probability or a level of uncertainty that defines things in quantitative terms. And there, let’s not take away the importance of expert judgment. And that is something the report has missed or at least not pointed out.

So if you can’t quantify uncertainties (like is climate sensitivity say 0.5 degrees or 6.5 degrees, and with what probabilities) just go with your best guess, call it expert opinion (especially if you only pick and pay the “right” experts) and say that there is a 90% certainty, even if there are no numbers you can add up to get that.

At JoNova. Go read the whole thing.