Those not selected to serve as a Lead Author or Review Editor for a given report traditionally serve as an expert reviewer for the particular report. (ipcc.ch)
So I hope you find these helpful, whether as authors, or as law review editors (or even law professors) recommending topics to authors. (volokh.com)
In addition to taking evidence from them and checking the relevant records of the IPCC process, we have consulted the relevant IPCC review Editors. (dotearth.blogs.nytimes.com)