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Coal, oil, natural gas, and other fuels that are ancient remains of decomposed plants and animals
the decrease in the pH of the Earth's oceans caused by the uptake of carbon dioxide (CO₂) from the atmosphere resulting in more hydrogen ions (H⁺)
CO₂ + H₂O ↔ H₂CO₃ ↔ HCO₃⁻ + H⁺ ↔ CO₃²⁻ + 2H⁺
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