Key Idea With respect to climate change, the main reason we care about acidity is that when carbon dioxide dissolves in water, it increases the acidity of water. Carbon dioxide (CO2) is the most important heat-trapping greenhouse gas that humans are adding to the atmosphere. When we burn oil, coal or gas, we are taking carbon from under the ground, changing it into CO2, and putting that CO2 into the air. CO2 is the main gas in the atmosphere involved in human-caused climate change, and CO2 is now causing the pH of the oceans to change.


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