This book describes how large-scale wastes can be used as a resource for making other materials. It covers metal processing wastes (slag, red mud), fly ash from coal combustion, electronic waste, and food waste. These wastes have potential to be used in bulk (e.g., for construction applications) as well as for niche applications (e.g., in the areas of catalysis). This book reviews literature from around the world on how large-scale wastes are in use by industry as well as research on the potential applications of wastes.