Hon DAVID PARKER: The advice I have is that this has to be taken into account with other measures relating to nitrogen contamination. There are already rules that prevent the decline of water quality or ecosystem health. There are rules to manage nitrate toxicity by directly requiring nitrogen concentrations in rivers to reduce to 2.4 milligrams per litre. There are rules to manage direct nitrogen concentrations in lakes, which has implications for upstream environments; targets to manage DIN in rivers to ensure bottom lines for ecosystem health like the macroinvertebrate index and periphyton are achieved; and rules to require that DIN levels are managed to ensure the health of environments downstream, like estuaries and wetlands. I think all of those things have to be taken into account, together with advice from the scientific advisory group.