With the increasing growth of large data storage and computational demand, Green Cloud Computing is known to be a broad area and hot field for research. To capitalize various IT resources, Cloud computing has produced an ultimate and impressing way to virtualize servers and data centers and to make energy efficient. The IT resources consume huge amounts of power and energy, which in turn produces shortage in energy and change in global climate. Therefore, there is a need of Green cloud computing which can produce solutions that can not only make the IT resources energy efficient but also minimize the operational costs. To solve environment related issues in the field of IT, Green IT is named to be an important step. It includes a huge number of focus areas for instance to provide proper management of power, virtualization of servers, design of data centers, recycling methods, eco-labeling, environment sustainability design and energy efficient resources etc. In this review firstly, a brief discussion on Cloud and Green computing is given then various application areas of Green IT are discussed and reviewed further. Based on the comparative analysis on Green-IT areas several research issues related to concerned Green IT areas, Objectives of such areas etc. are elaborated further.

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