How does rising atmospheric CO2 affect marine organisms?

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I have read that global climate warmed quickly about 12,500 years ago.  Could you comment on the possibility that it could do so again in the near future as a result of the ongoing rise in the air's CO2 content?

Submitted by: Bob Wingfield

The paleoclimate record is replete with evidence of such rapid and dramatic warmings.  However, they are basically a feature of glacial or glacial-to-interglacial transition periods.  Hence, we do not have even the remotest concern that such a climatic transtion could occur from the base state of the climate as it exists today.