So what? Well, shellfish need the ocean to be less acid--otherwise it kills the babies and interferes with shell growth when the shells use calcium carbonate.
Unfortunately for Washington State's large shellfish farming industry, a number of factors have brought the future to that area already, and the the state is spending millions on research to figure out if they can do something about it.
The same problem is affecting the world's coral reefs, which may exterminate them by mid-century, causing widespread famine in the tropical areas that depend on local fishing for subsistence.
You can read more about Washington State's shellfisheries problem here: