I don't have any figures with me but I can obtain some for you. There have been a number of studies done across North America, for example, on the impact of water pollution on human health. There have been a couple of incidents in Ontario, Walkerton being one that comes to mind. Outfits such as the Saskatchewan Watershed Authority were created because it was understood that there was an imminent threat from agricultural pollution. So there are data out there, and that's why I advocate getting these groups involved in the development and implementation of a national conservation plan. I think this would be a huge benefit to society.
On April 26th, 2012. See this statement in context.