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Abstract: Urbanization, sustainability, energy efficiency, information and communication technology (ICT) and nanotechnology are emerging at the beginning of the 21st century. They are seeking to improve environmental effectiveness in the context of connected communities, global competitiveness, economic development, climate change, and demographic shifts. Virtually all proposed solutions to energy consumption and climate change acknowledge the role ICT plays as a key enabler of environmental effectiveness. One of the major challenges that the ICT sector faces today is that hardware is being pushed to its physical limits. The traditional means to reduce product size, increase functionality and enhance computing capabilities are becoming difficult and expensive every passing day. On the other hand, the industry is benefiting from nanotechnology advances with numerous applications including those in smarter sensors, logic elements, computer chips, memory storage devices, optoelectronics, quantum computing, etc. This paper presents an overview of the ICT benefiting from development in nanotechnology with respect to sustainability and energy efficiency. [Copyright &y& Elsevier]