Yeah I understand you. I'm just trying to get across the point that we do know, as far as we can, but it's not enough for most people who are in denial. saying we should act the same way in either case is just an auxiliary way to shut those people up.

I think it's clear that if we could know, and if we could all agree on that, that it would be important to accomplish. but I don't think we can ever all agree on it. so it's not important to accomplish (in fact you could say it's already been accomplished, we already know, and it's not enough, we don't all agree despite the fact. that's what I'm trying to get across by arguing the point of human-caused real climate change)