The session focuses on specific interactions between clays and the environment. Thus, some of the subjects covered in this session are trace metals, soil quality and productivity, pesticides, landfill, clay barriers, radioactive waste disposal, transport of contaminants in clayey environments, clays in water management, fibrous minerals, and health. As our environment, our water and our soil are our most valuable treasures, the session conveys huge importance and very broad interest is expected.