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Ocean acidification is the ongoing decrease in the pH of the Earth 's oceans, caused by the uptake of carbon dioxide (CO 2) from the atmosphere.
Carbon dioxide CO2 and carbon monoxide CO are sometimes confused. They are quite different in their effects on humans. Carbon dioxide CO2 is present in the atmosphere today at 385 parts per million (by volume) or 0.039 percent. 50 years ago it was 280 parts per million. The increase is caused by people burning things, especially fuels - coal, oil, and natural gas, especially coal.