This book was made possible by the exceptional support provided by NATO Sci­ entific and Environmental Division, University of Maribor (Slovenia), Govern­ ment of the Republic of Slovenia, British and the United States Embassies (Ljubl­ jana, the Republic of Slovenia). The authors, as listed in this book, took the time to prepare excellent manu­ scripts focusing on various issues related to technological choices for sustainabil­ ity. These manuscripts were rigorously reviewed and refereed by scientists and engineers before inclusion in this book. An introductory chapter was prepared to provide an overview and to integrate technical issues covered in the book. A summary chapter is included at the end that provides a synthesis of panel discussions related to the three main sections of the book. The editors are most grateful to the contributors, sponsor organizations, and many colleagues who were kind enough to assist us in making this book possible. We are particularly grateful to Damjan Krajnc of the University of Maribor for compiling all the manuscripts in the correct format, creating the index, and assur­ ing that all the contents are faithfully presented in this volume. Background information about the editors and principal authors and contributors to this book fol­ lows.