Themed ‘Transforming Tomorrow’s Cities with Clean Environment Solutions’, the fourth biennial CleanEnviro Summit Singapore (CESS), organized by the National Environment Agency, Singapore, will be held from 8 to 12 July 2018, in conjunction with the World Cities Summit and the Singapore International Water Week. This is a global platform for industry and government leaders to identify, develop and share practical, replicable and scalable solutions to address environmental challenge in the context of the waste-water-energy nexus in tomorrow’s cities.