It occurred to me that the mere act of doing that would help moderate global temperatures, because you'd be covering more of the earth's surface with water.
The problem with solutions like the OP's is that, they actually do the opposite of what is really needed. Adding more land reduces the amount of sea/ocean, which means the remainder of the sea/ocean will have to be squeezed into a yet smaller area ... which means the level of the sea will have to rise. Granted, in schemes like the OP the amounts are tiny, but it's still technically doing the opposite of what is really needed.
If we're going to do some sort of geoengineering to compensate for rising sea levels, we should be creating more sea, not more land.
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"There's two kinds of men in the world. Those who have a crush on Linda Ronstadt, and those who never heard of her." - Willie Nelson
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