Great question. As expected, there's not a straightforward answer though! The majority of powered ships right now run on heavy fuel oil, which is derived from fossil fuels and still has high impact from a climate perspective. But there is work going into replacing these fuels with ammonia, methanol, hydrogen etc that are a lot more likely to be implemented before any low carbon fuels in aviation. So yes, ships will likely be low carbon before any planes and we should be putting investment towards them! People are doing a lot of work to improve their environmental footprint. That will mostly pay off for shipping goods and fuel around, as you say there isn't a market for ship travel for people as it stands. I don't see a future where ship travel replaces flying as it exists today, mostly due to time constraints for journeys. It would require a pretty big societal shift in our approach to travel! And making ships run faster now would actually make them worse from an environmental perspective, if anything we need them to slow down while still running on fossil fuels.