In mankind's relentless quest for prosperity, Nature has suffered great damage. The indefinite scale of global expansion has put the earth's very survival under threat. But against this exploitation of nature, there is a concept of Entropy that places a finite limit on the extent to which resources can be used in any closed system, such as our planet. Considering the impact of entropy, this book examines the key issues of sustainability—social, economic, and environmental. It discusses the social dimension of sustainability, showing how it is impacted by issues of economic inequality, poverty, and other socio-economic and infrastructural factors in the Indian context and concludes with projecting power sector scenarios till 2041–42 through alternative, realizable policy with respect to energy conservation and fuel substitution, and thus paving the way for the green power.