Nandita Basu is a professor at U. of Waterloo who studies the processes on farms and wetlands that affect the pollution of water in lakes. She is a modeller, so she collects data about fertilizer use and animal manure around the world, combining the data to see overall patterns is the whole data set, since particular areas differ. For the video, audio podcast, transcript, and public comments: https://tosavetheworld.ca/episode-567-water-sustainability.