And I’m surprised cargo ships still run mostly on novelty sized diesel engines. Would be interesting to throw a small ultra safe nuclear powered engine on one of those or even just enforcing better fuel use instead of spamming low grade MDO.

It's a real shame that NS Savannah was designed as a weird half-passenger, half-cargo hybrid that made it uneconomical to operate. It's even more of a shame that protesting by hysterical anti-nuclear fearmongerers got it banned from ports and scared off anybody from building more traditional cargo ships with nuclear propulsion.

Aviation is about a fortieth of the world's total emissions, so while there are certainly bigger sectors to look at it's still substantial enough that it'd be extremely helpful to fix it