Yeah those 2mm are going to solve all our sea level problems.I love that someone broke it down. And as I said, he's not wrong. A fraction of a millimeter is negligible, but it is something.
Loaded ship vs empty ship would displace a different amount of water as well, so this dude's math is probably off a bit unless he looked at every floating ship's freight documents.
Now just to figure out how to ship massive amounts of product internationally without boats?