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Here scientists tracked about two years of weekly pH data in Puget Sound to study the effects of ocean acidification. They found typical values of dissolved carbon dioxide, or CO2, in Puget Sound are more than 650 parts per million, higher than even the 400 parts per million threshold that Earth's atmosphere crossed last year for the first time in modern humans' existence. In other words, Puget Sound's water is already higher in the gas than our CO2-choked atmosphere. [Source: UW Today (University of Washington)]
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