Ocean acidification refers to the decreasing pH levels in the earth's oceans due to the absorption of excess atmospheric carbon dioxide (CO2). This process poses significant risks to marine ecosystems, including coral reefs and shellfish populations, as it alters the chemistry of seawater and affects organisms' ability to produce calcium carbonate. Research is ongoing to understand the broader implications of ocean acidification on global biodiversity, marine food webs, and fisheries. This tag compiles the latest studies, breakthroughs, policy discussions, and potential solutions related to ocean acidification.