I would first suggest that road salt is not toxic either, but it can be harmful to, for example, a row of apple trees beside the roadway. It can affect certain species of grass in the ditches, and that is a negative result.
There never was an assessment done on potassium chloride, which is potash. As I mentioned, when we mine potash, it's roughly 40% sodium chloride and 60% potassium chloride. When we separate it out, there's generally a bit of potassium chloride that ends up with the salt, so if you use that salt on the roads, there's a bit of potassium chloride in it. Whether that potassium chloride presents the same kinds of issues was never assessed. There was and there is some validity in the science of asking whether this alternative is better than sodium chloride for the environment, but I think the first step is to see whether, with good management practices, we can manage sodium chloride, which is the most cost-effective way of maintaining ice-free roads. If sodium chloride is $10 a tonne and another alternative is $150 a tonne, the first thing to do is to better manage the sodium chloride before you increase people's taxes that much.