Kurzinfo: The project 'Water at Risk' was the contribution of the 6c form of the private denominational academic high school of the 'Herz Jesu Missionaries' in Salzburg to the OECD/CERI-project 'Environment and School Initiatives'. An important element of the project was the role play 'Ecological Collapse of the Elbe'. In this article Hans Schuster documents the development and the results of this role play.