The Latin American Green City Index measures sustainability of 17 major cities in eight countries. In terms of environmental sustainability, Curitiba is Latin America's greenest metropolis, with other Brazilian cities, too, scoring above average. This is one of the results of a unique comparative study of 17 major Latin American cities carried out by the Economist Intelligence Unit on behalf of Siemens. Siemens presented the study findings at the World Mayors Summit on Climate in Mexico City.