I believe phosphorus is probably the most significant and dominant concern right now.
You are correct. We have made very good progress on toxics, and a lot of that had to do with the banning of PCBs and DDTs so we stopped the flow into the system. With projects like Hamilton harbour, where the legacy pollutants that are there already are taken away and secured, that is a further improvement.
We still have to be concerned about air deposition of toxics, believe it or not. That's the largest source now through air deposition—mercury.