The recent studies and analyses in the field of sustainable energy harvesting are discussed in this insightful book. Early 21st century has witnessed many developments in the field of sustainable energy harvesting technologies. Since then, many such technologies have evolved, advanced and even been successfully developed into hardware models for preserving the operational lifetime of low power electronic devices like mobile gadgets, smart wireless sensor networks, etc. Energy harvesting is a technique that harvests renewable energy which is freely and easily available from the environment to recharge or to put used energy back into the energy storage devices without the inconvenience of disturbing, or even discontinuing the routine operation of the particular application. Due to the information, experience and understanding gained in the past few years, there have been some major developments in the research of sustainable EH technology. This book looks at various features of sustainable EH technology and its future implications.