The effect of carbon dioxide on ocean pH levels is significant, leading to ocean acidification. As CO2 levels rise in the atmosphere, more is absorbed by oceans, forming carbonic acid. This process lowers the pH of seawater, impacting marine life, particularly organisms with calcium carbonate structures, such as corals and shellfish. Ocean acidification disrupts the balance of marine ecosystems, affecting species interactions and biodiversity. Addressing carbon emissions is crucial for protecting ocean health.