Promoting sustainability in today's world requires an understanding of the environmental burdens and social impacts of one region's consumption on other regions, both adjacent and remote. In recent years a growing body of research has quantified interregional flows of primary food crops and of embodied resources. However, most studies to date are limited to the national resolution, and mostly overlook sub- and supra-national divisions of space that emphasize varied socio-ecological circumstances. Very few recent studies have acknowledged the need to advance such interspatial analysis, and explore other relevant spatial scales, but they tend to focus on a single scale. Acknowledging the advantages and opportunities inherent in multiple scale analysis of the interactions between and within human and natural systems; this article proposes a method for a multi spatial scale analysis of the sustainability of interregional food systems, which unlike other currently available methods, enables a global and relatively complete analysis of an interregional food system. It then applies it to a case study of flows of crops and related croplands to Israel from different parts of the world, analyzed using multiple scales, such as: national, biome, ecoregion, river basin, and sub national administrative units. The findings are discussed with regards to Israel's remote environmental impact and dependency. They demonstrate how this approach can be used to provide an overview of a food system's interregional environmental interactions, identify otherwise hidden hotspots of environmental impact, and recognize interregional shared interests and trade-offs. These advantages make the method useful for national assessments of different countries' food security and food system sustainability.
Keywords: Environmental accounting; Food systems; Sustainability analysis; Telecoupling.
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