Agnostic pan(en)theist gorilla
Probably not enough to be detectable save on very sensitive measurements. And usually there are multiple bulk shipments going in multiple directions so probably all evens out in the end. Now, I do wonder how much the displacement of water by all those massive ships affects the water levels, esp. in confined waterways like the St. Lawrence Seaway. In the ocean it is probably negligible but in more confined spaces, it could be significant.When we ship bulk products from one part of the world to another, does that distort our gravitational fileld a little bit?