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Cloud computing has opened a new era to a shared IT infrastructure in which large pools of systems are linked together via the internet to provide IT services, such as different utility services of the authors' day to day lives like tax calculation web services, weather information web services etc; which are on pay per user basis. It provides a virtual resource and therefore is not limited by the power and capabilities of local or remote computers. But cloud computing is in its nascent stage of progression. It has some serious demerits. The data centre hosting cloud application needs huge consumption of energy, which is subsequently responsible for the emission of carbon dioxide gas, which aggravates global warming-a threat to existence of life on earth.
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