Bowing to the inevitable, IPCC vice chairman Jean-Pascal van Ypersele, has held his hands up and admitted that his beloved institution has "made some mistakes".
This is according to the Wall Stree Journal, hot off the press, citing van Ypersele saying that the climate summit in Copenhagen didn't rely "on the precise date of the demise of Himalayan glaciers, or African agriculture" to tackle global warming.
"It's the body of evidence" in the whole report that makes the case for action, he says, stressing that the revelations don't impugn the IPCC's main conclusions: that climate change is largely due to man-made greenhouse-gas emissions and could have dangerous consequences. Effectively, they are holding their hands up on "Africagate".
Nevertheless, Ottmar Edenhofer, a German economist who is co-chairing one of the main sections of AR5, admits, "This has not increased the credibility of the IPCC." "There is some room for improvement," he says.
Creeping in though is the fiction that the report is compiled by thousands of scientists and other experts who "volunteer their time" with the IPCC, as if this somehow excuses the sloppy work.
Like so many things to do with the IPCC, though, this misrepresents the truth. Most of the authors and editors are on secondment from their own national bodies, retaining their salaries and having their expenses fully paid, either by their sponsoring institutions or the IPCC.