ITU‐T's Technical Reports and Specifications 79 Ref. No. Category Definitions/Features Key concept/ Keywords Source Cities must also look at other methods of achieving sustainability, including resource efficiency, regenerating aging districts, ensuring robustness of systems, and incorporating design and planning in harmony with their natural ecosystem, as opposed to simply living in them. 36 Corporate A smart sustainable city is typically defined as \"an environmentally conscious city that uses information technology (IT) to utilize energy and other resources efficiently.\" In Hitachi's vision, a smart sustainable city is one that seeks to satisfy the desires and values of its residents, with the use of advanced IT to improve energy efficiency and concern for the global environment as prerequisites, and in so doing maintains a \"well‐balanced relationship between people and the Earth.\" Environment, ICT, energy, resource management, efficiency, environment, values of citizens, desires of citizens. Smart Cities: Hitachi (2014)