Don't forget places like Chad and Niger. Antartica is, as the parent post said, a reductio ad absurdum, but I often pay attention to how global warming (or even just bad years and seasons) affects agriculture and animal husbandry in places like Chad and Niger because it's a forewarning of what might happen to the north of Nigeria (the north is our breadbasket). We also import grain from places that are now having bad season after bad season and it does affect.

If, in the near future, food transportation relies on mostly clean or renewable energy, then it shouldn't be unsustainable to grow and import our pearl millet from a different country or even continent. It would also promote trade, which is sometimes desperately needed.

As long as the methods of production and transportation are sustainable and environmentally friendly, what would the issue be?

As a more realistic example, I think you can buy locally grown tomatoes in Finland all year round these days, or if not at least pretty close to it. A large portion of them are grown in Närpes, where day length dips below 5 hours in December. Keeping those greenhouses lit and warm is in no way ecological.

What about the space station? Shipping is expensive, but the real estate for farming is even more expensive.