Business German for advanced learners: The "Marktplatz" language course provides an introduction to topics related to work, career and economics. [English Version]
http://www.dw.de/germancourses/marktplatz?maca=en-DKpodcast_marktplatz_en-2261-xml-mrss
Marktplatz: Chapter 20
Getting Rid of Sewage Polluntants, sewage treatment plants, sewage removal: How water can be saved and kept clean. Topics: Sewage, environmental protection