[ethanbond]

"Significant societal change" doesn't always have to come from getting masses of people onboard. It can also happen, and often does happen, by people entrusted with power to make decisions even in the absence of complete information.

One heuristic such a person might use would be, "gee, are we really going to take the position that if you pollute so quickly and so widespread that it becomes nearly impossible to demonstrate specific harm, that you can just keep on doing that?"