Scientists expected that as atmospheric CO2 increased, more and more of the carbon dioxide would be absorbed into the ocean, affecting the chemical balance of the sea water, with a potentially harmful impact on shellfish and coral in particular.

　　“As carbon dioxide dissolves(溶解) in the water, or seawater in this case, it forms a weak acid, carbonic acid，”Dore explains. “And therefore, as the concentration of CO2 in the atmosphere goes up and that exchanges with the surface seawater, it drives the PH down, and makes it more acidic.”

　　The seawater Dore and his colleagues have analyzed confirms what the theory predicts.

　　The effect was particularly striking at about 250 meters down, and again at 500 meters. Dore and his colleagues came up with two possible explanations. It could be that surface water picked up CO2 and then moved to those depths. Or there could be a biological explanation.

　　“It's important to realize that the oceans are really becoming acidic. And it can have negative impacts on a whole variety of sea life from fish to coral. It's potentially catastrophic.”

　　【语篇解读】 研究表明，空气中的二氧化碳也会影响海洋生命。

　　56．What can be the best title of the passage?

　　A．Sea Life Facing Danger

　　B．Climate Change Affecting Seawater

　　C．Oceans Becoming More Acidic

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