Trains don't get you and your overseas goods across oceans (yet).
Tankers' environmental impact is disastrous, although they actually are comparatively quite CO2-efficient for shipping goods. It's just that there is so many of them now.
Source: https://3kpnuxym9k04c8ilz2quku1czd-wpengine.netdna-ssl.com/w...
I do wonder what happened to the Transatlantic tunnel