The IPCC, to my knowledge, has not made recommendations on targets. I don't believe that this is correct. What you, I think, are referring to is what we called in the negotiations the “Bali box”. This is table 13.7 in the fourth assessment report. The Bali box described the review of the literature, and it provided scenarios around which developed countries and developing countries would act.
The lead author of that, Dr. Dennis Tirpak, made a presentation at the second Bonn negotiations on that issue. He just tried to clarify exactly what they were saying. I have a copy of his presentation here, which I'm happy to share with the committee. I'm sorry, it's only in English, because it's not a Government of Canada document. It was prepared by Dr. Tirpak. He simply says, “The ‘25-40% below 1990 levels by 2020’ is not an IPCC conclusion or recommendation. It’s a summary of the findings of papers in the literature”.
The reality is that I don't think we can ask scientists to do our job, just as negotiators can't do your job as political leaders. Science can inform the decision-making. It falls to governments to decide what they will do and how they will do it, and that's very much the substance of the negotiations.