Friedo Zölzer is professor of environmental sciences at the Faculty of Health and Social Sciences at the University of South Bohemia in Ceske Budejovice, Czech Republic. His main professional interests are radiological protection and environmental health, as well as related questions of ethics. Gaston Meskens is a scientist, philosopher and artist. He works part-time with the Centre for Ethics and Value Inquiry of the Faculty of Arts and Philosophy of the University of Ghent, Belgium, and with the Science and Technology Studies group of the Belgian Nuclear Research Centre SCK•CEN.