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Your own source specifically says to be wary: "Note that life cycle CO2 emissions depend strongly upon details of supply chains, production techniques, forestry or agricultural practice, transport distances, etc."

Japan's coal imports are overwhelmingly local -- AUS and Indonesia. So even just on your claim that they are importing either way, the LNG is clearly a significantly worse supply chain. And to be clear, I am not arguing that coal should be their future; they might not have much of a better choice here in the short term, but there's also nothing to celebrate about switching to gas. They have the tech and know-how for other energy sources. They have opportunities for geothermal, expertise in nuclear, access to plenty of wind/tidal opportunities. I'm not sure how bad their landscape is for solar, though I would be a bit skeptical of any "there's just no room!" claims for them. Instead, they're putting huge capital into LNG, committing to longterm use of that product.

Again, nothing to celebrate here.

Besides which, consistently and throughout the product's history, LNG has had its emissions massively underestimated. I see no reason to suddenly believe we've suddenly started getting it right.

e.g.: https://www.research.howarthlab.org/publications/Howarth_LNG_assessment_preprint_archived_2023-1103.pdf

The cause of this is a long series of serious, terrible problems in the LNG supply chain from methane leaks at production sites to various leaky infrastructure at surface transportation to leaks at the export/import hubs (not to even mention the enormous energy costs of condensation). These issues that have so far largely gone unaccounted for in estimates that predicted how "diet" the fossil gas would be compared to coal, leading to a LOT of people holding a now orthodox belief that LNG is massively better that is, to say the least, highly optimistic.

When you also factor in things like the goddamn bunker oil used to transport the stuff, all that efficiency is gobbled up.

Anyone serious about climate, at this point, should be operating on the assumption that shipped LNG is no better than coal because the evidence we have that it is better is, frankly, really bad.