Coal, oil, natural gas, and other fuels that are ancient remains of decomposed plants and animals
6CO₂ + 6H₂O + light → C₆H₁₂O₆ + 6O₂
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + heat
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⁺
the process by which organic substances are broken down into simpler forms of matter
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