Well, changes from mantle and ice loading have already been accounted for. They actually contribute to a reduction in the amount of local sea level rise.I can see that the expansion would not be uniform; different levels of friction between tectonic plates, southern hemisphere cooling as the northern hemisphere warms, vice versa, and all that. Besides Antarctica having a larger load resting on it than the Arctic lands. Actually the Atlantic sea level is about 8" higher than the Pacific, too. That's a bit of a load difference, too.
Yup. It's a big number, too.
6.0221415 × 10 ^ 23
The rising sea level is part of eustatic, isostatic and steric changes. Those would be changes due to addition of more water, tectonic changes, and thermal expansion/salinity changes respectively. We already have a figure for how much sea levels are rising. We can estimate volume of water. Changes from tectonic or glacial rebound don't contribute to a change in volume of the oceans. So if we have more ice melting, and more warming of the water, then we will get a change in volume of the global oceans.
How DB and the others in here think that local sea level changes will disprove global warming is beyond me. Making the atmosphere more opaque to radiation isn't going to stop dynamic shifting of materials around islands, nor will it stop tectonic forces from forcing land up...
But it's more spaghetti they can throw against the wall...