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Dwindling oil supplies will pretty much take care of this "problem" in the next ten years. It won't be viable to grow crops (using oil-based fertilizers and pesticides) and then ship them 10,000 miles. Salads will get really boring.
In terms of larger issue security it's not wise for 1st world nations to give up their capacity to produce key products: food, steel, etc. So these things will continue to be subsidized.
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