Trucks are explicitly limited by weight, ships are somewhat limited by volume. Container ships especially need to be loaded way up because the cargo is less de

Trucks are explicitly limited by weight, ships are somewhat limited by volume. Container ships especially need to be loaded way up because the cargo is less dense than eg crude oil. Heavy trucks are also a much bigger issue than international shipping, which is only ~2% of global GHG. 6.7% of US GHG emissions come from medium and heavy duty trucks, or 23% of emissions due to transportation.