At present, mediated results are not recorded in the way legal decisions are. They can't be cited with the same effect in subsequent, similar, situations. There is a growing pool of experienced environmental mediators in the United States. Various states and federal agencies maintain rosters of such professionals. But there is no certification by any central body.
Mediators have very different levels of scientific background and mediation experience.
Some are lawyers while others are not. One unanswered question is whether there is a minimum level of competence that should be required of anyone who proposes to mediate an environmental dispute. The contrary view is that a system for selecting proxy representatives would not be hard to generate and would add to the democratic appeal of the new environmental regime. This is true and important, but it is not news. The hard questions remain.