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Perspectives Challenges and Future Directions. Sustainable development is triggering a re-assessment of innovation and technological change in all fields, and energy is no exception. A key challenge of energy sustainability is to examine the range of credible potential pathways of combined social, environmental and technological systems under conditions of uncertainty, stagger, personal preferences and complication. Conventional energy resources essentially fossil fuels are becoming limited because of the swift increase in energy demand. This disparity in energy demand and supply has placed enormous coercion not only on