This discounting of transport is absurd. The Swiss grid is hydro and nuclear. Transport is laughably short compared to the rest of the world. The biggest carbon input is natgas ro produce bound nitrogen, aka fertilizer. Storage, processing and refrigeration are grid bound.
Yet I read if you apply the MODELS they claim some Brazlian food can be more sustainable than local produced. (Discounting again the huge food waste problem!). Absurd.