If we’re going to build special walls to make the sea level higher in California than everywhere else in the world I vote for building them 100 feet high, not a few inches.
I didn’t read the entire article but I assume they’re talking about something like building walls to hold in the ocean since sea level is the same everywhere without them. If seismic activity causes the difference, they’ll have bigger problems than increased sea level.
No need for a wall.
The extra water will just flow downhill.
Oh, wait....