Do you think we will have carbon-free sea travel?

I wonder if that’ll become feasible in the near future. I can’t find any up-to-date articles. But the ones from one or two years ago seem to indicate 1kg of green Ammonia from solar farms in Egypt costs 4.50€. While a liter of crude oil was something like 13ct. So I think oil needs to become a lot more expensive to make this happen.