How well does the link need to be proven before we act? The fact that we haven't found the causal link yet is not proof that there isn't one. And a whole lot o

How well does the link need to be proven before we act? The fact that we haven't found the causal link yet is not proof that there isn't one. And a whole lot of correlation suggests that there is. Why should we not take this as yet another reason to regulate throwaway plastic?