Abstract
This special issue asked for high quality original research papers (including smart city experience papers) that made significant contributions to the state-of-the-art in "method and techniques to build sustainable smart city solutions" research area. Rapid urbanization is a global megatrend with 66 percent of the world’s population expected to live in urban areas by 2050. The staggering exponential increase in urbanization is leading to more people migrating to major cities in the search of better opportunities and quality of life. Cities need to increase the efficiency in which they operate and use their resources sustainability in order to meet the demands imposed by rapid urbanisation. The challenge is to continue providing basic resources such as sufficient fresh water; cleaner energy; transportation alternatives to commute efficiently from one place to another; adaption to changing climatic conditions; safety and security; while also ensuring economical, social, and environment sustainability.
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