The large scale pH of sea water is not being thrown off by anything that humans have any control over. There is no unbiased studies that prove any connection with worldwide CO2 levels and the health of crustaceans. Crustaceans have survived for hundreds of millions of years. They have lived through ice ages and millions of years when the levels of CO2 in the atmosphere were many multiple times what they are currently. Crustaceans will surely still be around long after the last man is long gone.
As far as actual pollution from man made sources, of course it should be prevented. This is a worthwhile effort that is being short changed by so much attention being focused on a bunch of fear mongering over absolute nonsense.
These folks look at stuff at this moment as if that is indicative of a trend. Geologic trends last tens of thousands of years. We are currently rising out of an ice in a long trend. We are in the middle of a solar minimum, and that will reverse.
Freakin’ people think just because it’s happening to them it’s never happened before. They are fools.