The IPCC isn't written in a vacuum. They are well aware of the political realities, and there are always fights between the draft stage and the final report.

The IPCC isn't written in a vacuum. They are well aware of the political realities, and there are always fights between the draft stage and the final report. As a result, the projects are skewed the the most conservative end range of possible outcomes, as no matter what is said there will be pushback and it is easier to defend the less aggressive projections than the median or aggressive projections.