Professor Peter A. Wilderer is in charge of the Institute an Advanced Studies on Sustainability, funded by the European Academy of Sciences and Arts. He teaches at the German Institute of Science and Technology, Singapore, in Industrial Ecology and Industrial Chemistry. Besides he serves as honorary professor at the Advanced Wastewater Management Center of the University of Queensland, Australia. In 2003, he became the first German recipient of the Stockholm Water Prize, internationally the highest award in the field of water and environment. He has authored and co-authored over 300 scientific publications. Professor Edward D. Schroeder is a member of the Department of Civil and Environmental Engineering of the University of California, Davis. He has authored or co-authored over 120 papers and two textbooks on various aspects of environmental engineering. Professor Horst Kopp is working at the Institute for Geography at the Friederich-Alexander-University Erlangen-Nuremberg, Germany. He is co-editor of The Arab World Geographer.