By R. Andreas Kraemer and Scott Vaughan, International Institute for Sustainable Development
By Daniel Ryan, research coordinator on sustainability, Postgraduate School of Instituto Tecnológico de Buenos Aires.
By Visit Portugal
By Simon TribelhornCEO of the Liechtenstein Bankers Association
By Michael SudarskisSecretary General, Internatonal Urban Development Association
By Peter BakkerPresident & CEO, WBCSD
By Arab HoballahChief, Sustainable Lifestyles, Cities and Industry, UNEP
By JERÓNIMO MARTINS