In the 1990s, the city won the United Nations Environment Program prize - UNEP, from the UN, said to be the top prize of the environment in the world. In June 1996, the chairman of the Habitat II summit of mayors and urban planners in Istanbul said Curitiba was "the most innovative city in the world." In 2003, the city received the title of Capital of Culture of the Americas by the organization CAC-ACC. In 2006, Curitiba hosted the event COP8/COP-MOP3 the UN. Today, Curitiba is considered one of the best examples of urban planning worldwide.