potentially harming sea life.

　　Montana State University scientist Robert Dore has been researching the water in the Pacific

　　Ocean for almost two decades. "We've been going to the same spot in the Pacific Ocean, and we

　　try and characterize long-term change in the open ocean environment. And one of the key things

　　that we measure is COx levels. And We've been able to record this increasing quantity of

　　atmospheric CO, into the ocean. "Scientists expected that as atmospheric CO2 increased, more and一

　　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 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 samples Dow and his colleagues have analyzed confirm what the theory predicts.

　　The effect was particular 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

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