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Présentation à partir des thèmes discutés dans l'ouvrage "L'avenir en question"
Raw materials are extracted from the environment and waste products are generally rejected in the environment, causing pollution. If the waste is recovered, it becomes a resource. It can help to reduce the consumption of raw materials while avoiding an additional pollution. Another way to reduce the consumption of energy and raw materials is to integrte the different activties by exchanging energy and material fluxes between different activities. Such a transition towards a "circular economy" would result in an economy able to operate in symbiosis with the environment, which is the condition required for staying sustainable.