Shipping by sea produces 1/60 the emissions of shipping by air and about 1/5 that of trucking. ~ Daniel Goleman (born: 1946-03-07 age: 65)   Ecological Intelligence: How Knowing the Hidden Impacts of What We Buy Can Change Everything Read online page 54.

Shipping is about 1/6 that of trains. In other words, shipping is better than trains and trains are better than trucks.