What is the effect of increased CO2 levels in the atmosphere on oceans?

Increased levels of carbon dioxide (CO2) in the atmosphere lead to higher concentrations of CO2 being absorbed by oceans. When CO2 dissolves in seawater, it undergoes a chemical reaction that produces carbonic acid. This process contributes to a decrease in pH levels in the ocean, which is often referred to as ocean acidification. The increased acidity has various ecological implications, particularly for organisms that rely on calcium carbonate to form shells and skeletons, such as corals and some shellfish. As the acidity increases, these organisms may struggle to maintain their structures, which can lead to broader impacts on marine ecosystems.

The other options do not accurately reflect the primary effects associated with increased atmospheric CO2 on ocean chemistry. While some species may benefit from enhanced photosynthesis under certain conditions, the overarching impact of acidification is more significant. Ocean temperature stabilization is influenced by various factors including currents and atmospheric conditions, rather than directly by CO2 levels alone. Marine ion life is not promoted by increased acidity; in fact, the change in pH can negatively affect many marine organisms and their interactions.