This book offers a comprehensive and insightful exploration of the technologies and processes involved in energy generation through waste treatment. It serves as a valuable resource, providing all the necessary information and tools for selecting the most sustainable waste-to-energy solution in various conditions. Moreover, it delves into real-life examples of the circular economy in action, offering a comprehensive overview from multiple perspectives. It employs a range of methodologies, including lifecycle assessment, sustainability assessment, multi-criteria decision-making, and multi-objective optimization modes. By combining these approaches, it offers a robust framework for evaluating waste-to-energy options.Furthermore, the book provides a thorough overview of waste-to-energy feedstocks, technologies, and implementation. It goes beyond mere description, delving into the critical factors and key enablers that influence the sustainable development of the waste-to-energy industry. By addressing these factors, the book facilitates the transformation towards a circular economy, moving beyond the traditional "e;call to arms"e; approach.This book is an invaluable resource for researchers and policymakers in the energy sector. It equips them with the scientific methodology and metrics necessary to develop strategies for a viable sustainability transition. Additionally, it serves as a key reference for students, researchers, and practitioners seeking to deepen their knowledge of energy planning and the current and future trends of biofuel as an alternative fuel.