“…As we try to reduce harms and manage the environment, it is much more difficult to identify unintended consequences. If we restrict or ban a class of chemicals (e.g., per-and polyfluoroalkyl substances (PFASs)), 14 where in modern life will the effect be felt? Will it still be possible to manufacture a medicine if a PFAS used in the process, or one lining a pipe, cannot be bought?…”