I don't want to derail this discussion of cycling, which is awesome, but what would global emissions look like if all cargo vessels in the ocean had to have fis

I don't want to derail this discussion of cycling, which is awesome, but what would global emissions look like if all cargo vessels in the ocean had to have fission reactors like US aircraft carriers, instead of burning the cheapest, most environmentally damaging oil possible in a global no-mans-land free of environmental laws?