Représentation dans l’Analyse de Cycle de Vie des impacts environnementaux des usages de l’espace marin – illustration sur les activités de pêche et d’algoculture. Langlois, J. Ph.D. Thesis, Montpellier SupAgro, Montpellier, France, 2013.
Représentation dans l’Analyse de Cycle de Vie des impacts environnementaux des usages de l’espace marin – illustration sur les activités de pêche et d’algoculture [pdf]Paper  abstract   bibtex   
Life Cycle Assessment (LCA) is a robust tool often used for eco-design. It allows the assessment of environmental impacts, at a global scale, accounting for all stage of a product life cycle, “from cradle to grave”. There is a methodological gap in this method to account for occupation and transformation impacts in marine ecosystems due to human activities. The task accomplished during this PhD is the development of a methodological framework for a new impact category in LCA to overcome this lack: the sea use. The general framework for sea use had to be defined. It has been built following the example of land use and integrating the new methods developed for LCA of seafood. Thus, a bibliographic work has been performed on the topic of land use and of LCA of fisheries and aquaculture. Cause-effect chains, linking human interventions to the potential impacts they can induce on their environment, were precisely defined. We focused on one of these cause-effect chains in particular, with the aim to build an operational impact assessment method. The method has then been made operational for the assessment of occupation and transformation impacts on the ecosystem life support functions. Because impacts of biotic biomass removal are an essential concern in marine ecosystems, the method has first been applied to fisheries. It was also exemplified on the case of offshore cultivated seaweed, as a casestudy of ecodesign using LCA for seafood. Thus, a new operational methd of sea use impact assessment is proposed and can be applied to case-studies. (PhD thesis in French including journal articles in English)

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