Cats on TTI exhaust system

Trying to cure the evils of air pollution with automobiles is a moot point if you start looking at pollution caused by the use of bunker fuel in the global shipping industry. I’m surprised there hasn’t been more push forwards nuclear propulsion on that industry like is seen in the Merchant Marines and Naval fleets of the world. Some sources report that the sulfurous output of global shipping is four times greater than all the cars on earth.