Regionalised LCA of territorial food supply: assessing the environmental performance of French contrasted scenarios up to 2050.

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Poster Number:  22 

Main Presenter:    Lazare Deteix 

Co-Authors:   Thibault Salou     Eleonore Loiseau                                          

Recently, the French agency for ecological transition (Ademe) proposed contrasted prospective scenarios to achieve carbon neutrality by 2050 including a focus on the food sector. However, these studies remain focused on climate change and do not consider other environmental impacts, which can hide potential pollution transfers. Furthermore, these studies were carried out on a national scale without taking into account food supply local specificities. The aim of this work is therefore to implement a regionalised LCA of the food supply of a French city in 2050 according to several contrasted prospective scenarios.
The general methodology is based on a downscaling of the prospective scenarios, from the national scale to the city scale to model the food supply for the city of Montpellier (southern France) in 2050. Forty representative products of the French food consumption were selected to model food supply, from agricultural field to delivery to point of sale. The initial inventory data comes from the Agribalyse 3.1.1 and Ecoinvent 3.8 databases. They are then adapted according to the main features of each prospective scenario , i.e. i) the composition of the electricity and gas mixes, ii) the origins and volumes of agricultural and food imports, iii) agricultural practices trend, and iv) different diets within the population and the resulting quantities of food consumed.
Inventories of imported food products are also regionalised at country level by adapting the electricity and fertiliser mixes.
Environmental impacts are computed with the Impact World + method. It allows to quantify regionalised midpoint indicators for water scarcity, land occupation & transformation, eutrophication and acidification. A comparison is made with the site-generic midpoint indicators to observe the effect of impact regionalisation.
Results indicate that in all studied scenarios, the main impacts arise from animal product consumption and agricultural production stages, with certain variations according to the impact category, considered food products and scenarios. In addition, by analysing the scenario parameters, such as the proportion of organic food consumed or the switch to a vegetarian diet, it is possible to determine, for each scenario, which parameters will have the greatest influence on the impacts, and thus to formulate recommendations to reduce the environmental impacts of territorial food supply.
Finally, the comparison of impact results between site-generic and regionalised midpoint indicators shows differences in results of up to 80%, which underlines the importance of regionalising LCAs (both inventory and impact) to assess the impact of local policies.

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