How does rising atmospheric CO2 affect marine organisms?

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Collins Ice Cap, King George Island, Antarctica
Hall, B.L. 2007. Late-Holocene advance of the Collins Ice Cap, King George Island, South Shetland Islands. The Holocene 17: 1253-1258.

The author presents "radiocarbon and geomorphologic data that constrain [the] late-Holocene extent of the Collins Ice Cap on Fildes Peninsula (King George Island, South Shetland Islands: 6210'51"S, 5854'13"W)," based on field mapping of moraines and glacial deposits adjacent to the ice cap, as well as radiocarbon dates of associated organic materials. This work yielded, in Hall's words, "information on times in the past when climate in the South Shetland Islands must have been as warm as or warmer than today," with the specific period of this warmth indicated to stretch backwards in time from about AD 1300, which latter date would signify the end of this period of significant warmth, i.e., the Medieval Warm Period, with no date given as to its beginning.