Group forams talking about sex. When carbon dioxide dissolves in water, it triggers chemical reactions that create carbonic acid.

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Since the midth century, when people started burning fossil fuels in huge amounts, the pH of the global ocean has dropped by a tenth of a point, notes Nyssa Silbiger.

They added enough CO 2 to bring the pH down to 7.

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They, too, create their elaborate structures from calcium carbonate.

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Those hydrogen ions add to the hydrogen ions already present, making the seawater more acidic.

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Rivest and G.

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Published online April 25,

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That tenth of a point may seem small.

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In Australia, Scanes finds there are more female and fewer male Sydney rock oysters — which could affect how many oysters fill the plates of future Australian diners.

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Scanes and his colleagues published their results February 14, in the Proceedings of the Royal Society:

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That brings the pH back down — making it more acidic.

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A substance with a pH of 8 has 10 times the amount of hydroxide ions as one with a pH of 7.

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