Which greenhouse gas is a major cause of ocean acidification?

When we speak of global warming, we usually mean the rise in average global temperatures since the beginning of the Industrial Age. This is mainly caused by carbon dioxide, the atmospheric concentration of which has increased by over 35 per cent, from the long-term range of 260-280 parts per million (ppm) to the present level of over 380 ppm. Another greenhouse gas that has made a significant contribution to global warming is methane, which is a far more potent greenhouse gas but fortunately exists in much lower concentrations.
Carbon dioxide is the greenhouse gas that is largely responsible for global warming.