The <e1>acidity</e1> is caused by the gradual buildup of <e2>carbon dioxide</e2> (CO2) in the atmosphere, dissolving into the oceans.
The acidity is caused
The acidity is caused by the gradual buildup of carbon dioxide (CO2) in the atmosphere, dissolving into the oceans.
<triplet> acidity <subject> carbon dioxide <object> Cause-Effect(e2,e1)