I doubt we can impact on the oceans in such a way. They are much too big. We can over fish the ocean. We can over exploit fisheries. But the oceans are too big for mankind to turn acid. But perhaps some scientists can get research grates and employment from this non-issue
It's fine to be skeptical, but in this case, the science is very strong, so your doubts are trumped by data. I invite you to read the paper linked in post 44.