Green chemistry or also known as sustainable chemistry is the design of chemical products and processes that reduce or eliminate the use or generation of hazardous substances. Green chemistry applies across the life cycle of a chemical product, including its design, manufacture, use, and ultimate disposal. Green chemistry reduces pollution at its source by minimizing or eliminating the hazards of chemical feedstock, reagents, solvents, and products. This book also looks at technology to degrade pollutants as well as utilisation of greenhouse gas CO2 to produce methanol. The latest research collections on green chemistry in this book will inspire students, researchers, and scientists ideas on research in producing products that do not cause pollution or harmful to nature.