> personal cars in transportation.

the EPA[1] says 4.6 metric tons of co2 from an average car. There were[2] 1bn cars in service globally, as of 2010.

“It has been estimated that just one of these container ships, the length of around six football pitches, can produce the same amount of pollution as 50 million cars."[3]

1bn/50m = 20 cargo ships equal the estimated world carbon footprint of automobiles.

There are 50,000 cargo ships globally. There's your problem, go nuclear or go home.

[1] https://www.epa.gov/greenvehicles/greenhouse-gas-emissions-t... [2] https://www.worldometers.info/cars/ [3] https://inews.co.uk/news/long-reads/cargo-container-shipping...