Green nanotechnology holds the key to transforming industries and addressing global challenges with sustainable solutions. This book explores the applications of green nanotechnology across diverse domains, from ecosystem sustainability and sustainable agriculture to cutting-edge manufacturing processes and advanced environmental monitoring. It explores innovative approaches for water purification, oil spill remediation, and wastewater treatment, along with advanced techniques for food preservation, energy harnessing, and controlling air and ocean pollution. Applications, including drug delivery and health monitoring using nanosensors, are discussed in detail, alongside critical perspectives on eco-nanotoxicology to ensure responsible and sustainable implementation. Authored by a team of 67 renowned scientists from five countries and featuring 18 meticulously reviewed chapters supported by 23 tables and 116 color figures, this book is a comprehensive guide for researchers, policymakers, and professionals striving for a sustainable future powered by nanotechnology.