(Geneva) – In today’s Declaration on Waste Containing Nanomaterials, the Center for International Environmental Law (CIEL), ECOS, and the Oeko-Institut emphasize the importance of adopting and implementing preventive measures to protect people and the environment from possible hazards of manufactured nanomaterials (MNMs) in waste streams. With the toxicity of nanomaterials still largely unknown, a tight control of waste containing MNMs is crucial.