ICLEI is the world's leading association of cities and local governments dedicated to sustainable development, with a membership of 12 megacities, 100 super-cities, 450 large cities and urban regions, and 450 small- and medium-sized cities in 86 countries. It promotes local action for global sustainability and supports cities in: becoming sustainable, resilient, resource-efficient, biodiverse and low carbon; building smart infrastructure; and developing an inclusive, green urban economy. The ultimate aim is to achieve healthy and happy communities.