To be sustainable goods would have to be walked to the coast, obviously impracticable for large items or items in bulk.
Possibly the JSO crew should stop eating bananas,oranges and other citrus fruits, advocados, any exotic fruit, coconut, rice, pasta, quinoa, olive oil etc etc etc. No more clothes or shoes manufactured in India, China, Far east. No more pharmaceuticals, nothing made by machinery which needs oil for lubrication. No crops requiring insecticides or fertilisers, in fact grain only harvested by scythe and milled by wind or water.
The fact is we live in a capitalist, industrialised society, globally interdependent world.
I have no time for JSO proponents who seem to be largely middle aged, middle class, naive, non productive people with too much time on their hands