"The objectives of the book are shaped by the emerging requirement of alternative fuel and increasing rate of organic waste generation, which includes waste plastic, biomass waste and municipal waste. Research practices in the field of waste to energy will be the primary focus of the book. The idea of proposing this book is to make readers aware about the recent trends in the field of solid waste management. A collection of research/review articles based on various biological and bio-chemical approaches for solid waste management will be covered in this book that can provide research insights into the field of waste valorization. Process design consideration and engineering practices associated will be discussed in detail from the eco-technie perspectives. Sustainability, eco-toxicity, life cycle assessment and recent progress in reference to waste management need to be documented to provide readers a microscopic view of the major issues and their possible solutions. This handbook covers all major perspectives of sustainability paradigm and therefore it will provide a comprehensive information of this topic to the readers. We believe that covering the research insights into the solid waste management certainly give a direction to future prospects and help to differentiate between the reality and aspiration of "what do we know about waste? What can/cannot be done with this waste?""--