I stumbled on a recent article on the guardian newspaper: https://www.theguardian.com/environ...m-ships-at-sea-to-be-regulated-for-first-time I was wondering if that was realistic or just some sort of public relation stint. The regulation set a distant future date tu curb commercial ship's emissions by half. 2050 How would you do that ? I heard about experiments with big kites or rotorships to reduce fuel consumption. But the savings were modest. Gas turbines would displace the pollution problem since natural gas extraction can pollute a lot. For example trough leaks of methane. Nuclear ships are heavily boycotted. The nucleophobe movement does not seem to do a pause. I am aware of only one nuclear cargo and a few icebreakers in service.