History is full of examples of acting without evidence, with disastrous results. Thankfully, in this case, we can have high confidence that the absence of PFAS is not a health risk. So the cost of action without evidence is purely financial. It’s not clear to me the global economic impact of banning these chemicals, but I’m struggling to forecast anything large enough to care. For this reason, I support banning these chemicals. The case for historical claims is murkier without evidence.