You're jumping to conclusions and making assertions way beyond what I'm saying. We're not ADDING salt to the oceans, we're just putting back what we took out. That has nothing to do with dumping plastics or other wastes in the ocean. Things would be very different if we mined salt from Mars and dumped that into our oceans - that would be adding things that didn't come from it just a few days or weeks ago. And understand that all the freshwater we removed would make its way back to the oceans too - that's how the water cycle works. That's the beauty of desalinization - we're just borrowing the freshwater from the ocean for a brief period of time again and again and again, which is what the normal process of evaporation, rainfall/snowfall, and runoff does constantly. The reason desalinization isn't practiced more often is because its energy intensive and expensive, but it's far less energy intensive and expensive as building a fleet of interplanetary mining and transfer ships.