On this episode of Parts Per Billion, we speak with the mayor of a California border town who's struggling with an international pollution problem. After big rain storms, raw sewage can seep into a river in Mexico that flows across the border into his town. Though the mayor is frustrated with his neighbors to the south, he says Donald Trump's harsh rhetoric is making all of these issues harder to solve. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.