Book excerpt: Biogenic Sustainable Nanotechnology: Trends and Progress focuses on the green synthesis of nanomaterials with various biological systems, emphasizing the mechanisms of nanomaterial synthesis, spectroscopic characterizations, and applications in a variety of industrial sectors. Interest in developing eco-friendly, green, cost-effective, and facile methods for nanomaterials synthesis is rapidly growing. Green synthesis methods focus on a greener environment, minimizing generated waste, and implementing sustainable processes. As discussed in this book, green nanostructured materials often include phytochemical agent extracts, such as carbohydrates, flavonoids, saponins, proteins, amino acids, chromone, steroids, phytol, and terpenoids. These phytochemicals from plant extracts play a crucial role in improving the reduction rate, size, and stabilization, by acting as good reducers, surfactants, structure directors, and capping agents. This book is an essential reference source for materials scientists, bioengineers, and environmental scientists. Outlines the major synthesis methods used to create environmentally-friendly bionanomaterials for biomedical applications Explores how environmentally-friendly bionanomaterials are used for a variety of industry sectors Assesses the major challenges of producing environmentally-friendly biogenic nanomaterials on an industrial scale