Three lead authors of IPCC say we have been misinformed. These authors recently chaired an unusual, but welcome, sidebar for a standing-room only crowd. As such, their point was that it is misleading to refer to IPCC as thousands of scientists in some sort of agreement.
Nations elect a bureau and working groups of between five to twenty science authors.
Summaries of the working groups are drafted by a small subset of these contributors. IPCC is not science. At its best, it is an assessment of science. At its worst, it is political science. Those are political choices, not science assessments.