Changing the sea's acidity level ...

[Axtremus]

... is a very ambitious project, now thought to be necessary to ward off severe global warming:

https://www.nytimes.com/2026/01/08/magazine/ocean-acidification-carbon-geoengineering.html?unlocked_article_code=1.C1A.48e1.JkCN_Wg6oJE3

The Scientists Making Antacids for the Sea to Help Counter Global Warming
The world’s oceans are becoming dangerously acidic. A controversial proposal would raise the pH — by mixing chemicals [lye] into the water.

[jon-nyc]

A few Frats at UC Santa Bárbara could do it in a few weeks if they put their mind to it.