Green energy has gained global significance with increasing demand and need for sustainable energy resources. There has been a significant focus on procuring energy from non-conventional, natural resources like sunlight, tides, plants, algae, etc. This book contains some path-breaking studies that explore various aspects of renewable energy. The topics included in this book on energy efficiency and energy security are of utmost significance and bound to provide incredible insights to readers. The book presents researches and case-studies performed by experts across the globe which emphasize on global socio-economic issues and different alternative energy resources. Those in search of information to further their knowledge will be greatly assisted by this book.