Bonn has made it a tradition to organise international Mayors' Conferences in the framework of major international conferences. No fewer than 300 heads of cities from all over the world attended the very first Mayors' Conference in 1999 to discuss strategies for the control of desertification. The opinion of cities is in demand, and their voice heard! Like in 2008, when four Mayors from four continents brought the Bonn Call for Action into the 9th Conference of the Parties on Biological Diversity in Bonn.

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