this post was submitted on 28 Sep 2023
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As I understand it such "waste salt" is usually returned to the ocean in the form of brine. The brine is denser than the ocean water around it so it flows down the slope of the land like a river into the deeps where it eventually dilutes back into the ambient water.
Brine flows and brine pools happen naturally in some places in the ocean already. They're common underneath sea ice - sea ice is pure water and brines flow out of it as it forms. There are brine pools in the depths of the Mediterranean because that sea has greater evaporation than it does fresh water inflow. It's not some new horror humanity is inflicting on the ocean. If care is taken with routing the brine it shouldn't cause much trouble to the ecosystem.
It's already a problem in some areas. It's the scale that we do things at that causes the problem.
CO2 also exists in large quantities by natural process, but when you increase it on a massive scale for a century, it adds up to disaster.