When carbon dioxide dissolves in seawater, the water becomes more acidic and the ocean’s pH (a measure of how acidic or basic the ocean is) drops. But in the past decade, they’ve realized that this slowed warming has come at the cost of changing the ocean’s chemistry. Since the beginning of the industrial era, the ocean has absorbed some 525 billion tons of CO 2 from the atmosphere, presently around 22 million tons per day.Īt first, scientists thought that this might be a good thing because it leaves less carbon dioxide in the air to warm the planet. At least one-quarter of the carbon dioxide (CO 2) released by burning coal, oil and gas doesn't stay in the air, but instead dissolves into the ocean. Ocean acidification is sometimes called “climate change’s equally evil twin,” and for good reason: it's a significant and harmful consequence of excess carbon dioxide in the atmosphere that we don't see or feel because its effects are happening underwater.
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