Cordoning Corrosive Ocean

Imagine the entire ocean becomes extremely corrosive due to ocean acidification over a couple of decades, all nations have agreed to erect a permanent barrier along all shorelines to seperate land and acid which is gradually eating away the beach. The acidity of the ocean on average is below 1 on the ph scale and the cause remains unknown and leads to many speculations and this is a major mass extinction event on a planetary scale. My question is how can I cordon the ocean effectively? I believe the wall should be made of a particular kind of ceramic or other corrosion resistance material casts into huge blocks before lowering into place but that will take too many centuries (compare to Great Wall of China even with modern day technology) My ideal duration for the Poseidon's Towel Project should not be more than a decade.

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Cordoning Corrosive Ocean

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