This lecture presents the collaborative project 'Léman 21' involving researchers from various institutions such as UNIL, EPFL, Eawag, and Unige. The project focuses on studying the development of microorganisms in nutrient-rich environments. The lecture features contributions from Dr. Nathalie Chèvre, Vincent Gregorio, Florence Bonvin, Nadine Czekalski, and Anh-Dao Le Thi, highlighting their research in mineralogy, geochemistry, environmental chemistry, and surface water. The video credits include the team responsible for the production, mixing, and editing of the content, showcasing the interdisciplinary effort put into environmental research at EPFL and its partner institutions.