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The spiral concept of Green Library is captivating to the entire library professionals worldwide. This is also called sustainable library. The present paper discusses about overview of the technical development of green libraries of academic institutions in US based libraries and other developing countries i.e. UK, Canada and India. Which also focus on the workflow, features, aims and objectives, scope and limitations, betterment of green libraries and the role of librarians. The paper also focuses on the role of initiatives like UNDP, IGBC and LEED.