How does rising atmospheric CO2 affect marine organisms?

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The Little Ice Age in the Arabian Sea
Doose-Rolinski, H., Rogalla, U., Scheeder, G., Luckge, A. and von Rad, U.  2001.  High-resolution temperature and evaporation changes during the late Holocene in the northeastern Arabian Sea.  Paleoceanography 16: 358-367.

What was done
The authors analyzed a complete and annually-laminated sediment core extracted from the bed of the northeastern Arabian Sea just south southeast of Karachi, Pakistan, using oxygen isotopes of planktonic foraminifera and measurements of long-chain alkenones to derive a detailed sea surface temperature and evaporation history for the area.

What was learned
The greatest temperature fluctuations of the 5,000-year record occurred between 4600 and 3300 years ago and between 500 and 200 years ago, which periods were also the coldest of the record.  Of the latter interval, the authors note that "in northern and central Europe this period is known as the 'Little Ice Age'," and they say that their results "confirm [the] global effects" of this unique climatic excursion.  Also apparent in their temperature history is a period of sustained warmth that prevailed between about 1250 and 950 years ago, which corresponds nicely with the Medieval Warm Period of northern and central Europe.

What it means
Once again, and contrary to the claims of certain climate revisionists, new evidence continues to confirm the global nature of both the Medieval Warm Period and the Little Ice Age.  This evidence also indicates that neither the current state of earth's climate nor its rate of change are anything out of the ordinary, which is also contrary to the claims of the politically-correct revisionists.