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Environmental assessment of biofuel pathways in Ile de France based on ecosystem modeling

Gabrielle B., Gagnaire N., Massad R.S., Dufossé K., Bessou C.. 2014. Bioresource Technology, 152 : p. 511-518.

The objective of the work reported here was to reduce the uncertainty on the greenhouse gas balances of biofuels using agro-ecosystem modeling at a high resolution over the Ile-de-France region in Northern France. The emissions simulated during the feedstock production stage were input to a life-cycle assessment of candidate biofuel pathways: bioethanol from wheat, sugar-beet and miscanthus, and biodiesel from oilseed rape. Compared to the widely-used methodology based on fixed emission factors, ecosystem modeling lead to 55-70% lower estimates for N2O emissions, emphasizing the importance of regional factors. The lifecycle GHG emissions of first-generation biofuels were 50-70% lower than fossil-based equivalents, and 85% lower for cellulosic ethanol. When including indirect land-use change effects, GHG savings became marginal for biodiesel and wheat ethanol, but were positive due to direct effects for cellulosic ethanol. (Résumé d'auteur)

Mots-clés : analyse du cycle de vie; cycle biogéochimique; miscanthus; betterave sucrière; triticum; brassica napus; dioxyde d'azote; utilisation des terres; Évaluation de l'impact; impact sur l'environnement; modélisation environnementale; agroécosystème; gaz à effet de serre; Éthanol; biocarburant; production énergétique; Île de france; nord-pas de calais; filière

Thématique : Sources d'énergie renouvelable; Culture des plantes; Conservation de la nature et ressources foncières; Météorologie et climatologie

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