Any form of scientific literature that you can site and say, "Hey, look, these scientists have found solid, tangible evidence that the ocean is in fact getting more acidic." It goes without saying that primary articles are best. Anything that can serve as evidence.
If a study was done that found that the calcification process of organisms is being affected negatively, and they attributed that to ocean acidification, then that counts as evidence. If a study was done taking pH levels of oceans in various regions over time intervals and it was found that the oceans are getting more acidic, then that counts as evidence.
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