As is well known, fossil fuels and food waste are significant contributors to the climate change crisis. Conversion of food waste to energy can help solving or mitigating these problems by providing a sustainable energy alternative to fossil fuels. This book provides an overview of technologies to convert food waste to energy. It explains the rationale behind this approach and describes different methods of turning food waste into energy, factors affecting the productivity of these processes, and the advantages and challenges of these technologies. Current research in the field and selected case studies are also described.