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This also means ammonia may end up getting produced at the globally best places, the places where the solar resource is extremely good, like Chile, Namibia, parts of the middle East, then shipping elsewhere.

Sunny places with good ports and cheap land.

Shipping ammonia is commonly done already. For example, the first few search results for "ammonia tanker" has a story of Maersk ordering up to ten new tankers with 93000 cubic metre capacity each.

This is illogical - we ship a live nuclear reactor around the world in a nuclear carrier or icebreaker. But you cannot take it out and put it on a truck

That has more to do with the design of the vessel than anything.