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On this page you will find an explanation of the ISO 20400 guidance. Is your question not mentioned?

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What questions does ISO 20400 answer?

How can I procure products in a way that prevents them from ending up in the landfill as waste, and instead allows them to be reused as raw materials? How can I make a positive contribution to the working conditions under which our raw materials are produced? How can I contribute to energy reduction?