Researchers pointed out that since the industrial revolution, the capacity and scope of human activities have increased significantly. At the same time, the PH value of the ocean is gradually decreasing. 
Human activities before the industrial revolution did not lead to ocean acidification.
 there is a causal relationship between human activities and changes in the ocean, which will cause irreversible damage to the marine ecosystem. However, opponents believe that the carbon dioxide contained in the atmosphere is the chief culprit leading to ocean acidification. If there is no ocean to absorb carbon dioxide, the carbon dioxide in the atmosphere is much higher than the current level, and the impact of global warming will be more serious.