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Explain how burning fossil fuels can lead to a lower ocean pH. short paragraph

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Burning fossil fuels releases large amounts of carbon dioxide (CO2) to the atmosphere; about a third of that CO2 is absorbed by the oceans, where it reacts with water to form carbonic acid (CO2 + H2O ⇌ H2CO3). Carbonic acid dissociates to produce bicarbonate and free hydrogen ions (H+), and the rise in H+ concentration lowers seawater pH — a process called ocean acidification — which also reduces carbonate ions needed by shell-forming organisms.