Get back to me when a freighter carrying 50,000 tonnes of cargo can cross an ocean without fossil fuels. Lightweight toys created to "prove the concept" are not that useful in the real world.
Yes, cargo transport is extremely high density. That doesn't mean however that we should do nothing, or that in fact nothing is being done. It will probably be supplementing rather than replacing the fossil fuel burning, but with a combination of solar, wind, and slower speed, a significant reduction of fossil fuel consumption can be made. Yes, if we continue to subsidize these transports with cheap fossil fuel that ignores the reality of the situation they are causing for current* and future generations then we are shooting ourselves in the foot.
You are always talking about nuclear power, but somehow ignore the possibility for dense cargo transport.
*current - yes current generation problems. Bunker fuel is one of the worst pollution problem we currently face, not just with green house gases, but the highly toxic sulfur and other emissions from menace sailing the seas.
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