Green computing is the study and practice of using computing resources efficiently. The plan towards green IT should include new electronic products and Services with optimum efficiency and all possible options towards energy savings.In order to achieve sustainable computing, we need to rethink from a “Green Computing”perspective. Green computing or green IT, refers to environmentally sustainable computing or IT. In the article Harnessing Green IT: Principles and Practices, San Murugesan defines the field of green computing as "the study and practice of designing, manufacturing, using , and disposing of computers, servers, and associated subsystems—such monitors, printers, storage devices, and networking and communications systems—efficiently and effectively with minimal or no impact on the environment." The goals of green computing are similar to green chemistry; reduce the use of hazardous materials, maximize energy efficiency during the product's lifetime, and promote the respectability or biodegradability of defunct products and factory waste. Research continues into key areas such as making the use of computers as energy-efficient as possible, and designing algorithms and systems for efficiency-related computer technologies.