At this point all I can say is that various countries have defined the concepts differently. They have started with the same term, “healthy environment” or “clean environment”, and then developed further definitions that are not all the same.
Given that there isn't a clear and consistent approach, the approach that's codified in the bill at the moment is to start with this general terminology and then unpack it through a public process to develop an implementation framework.
I don't know if I can elaborate much more than that. I apologize.