re: What about just making it a salt water marsh?
Every little bit helps.
I wonder how many months of rising sea level it would stop?
If we really wanted to lower the sea level and create some land in the same process, build some huge islands out of ocean bed material. Once the material gets above sea level, sea level starts dropping. Oh, but what a massive feat.
It is too bad we don’t have the means to really lower the sea level. Imagine having the Continental Shelves as land. But then you would to counter the climate problems created.