How does rising atmospheric CO2 affect marine organisms?

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Terra Nova Bay, Victoria Land, Antarctica
Baroni, C. and Orombelli, G. 1994. Holocene glacier variations in the Terra Nova Bay area (Victoria Land, Antarctica). Antarctic Science 6: 497-505.

In the words of the authors, they describe and analyze "data obtained during studies carried out by the Italian Antarctic Research Programme (1985-1991) in the Terra Nova Bay area, Victoria Land." Of most significance to the Medieval Warm Period, in this regard, were data pertaining to the Edmonson Point Glacier (7420'S, 16508'E), which abuts a small ice-free area along the eastern coast of Mount Melbourne. Baroni and Orombelli state that a withdrawal phase of the glacier's cliff front "is documented by a horizontal marine ingression of more than 150 meters and the deposition of coastal marine sediments," noting that "the dates relative to this withdrawal phase correspond to a calibrated age between the 10th and the 14th centuries, a time interval including the Medieval Warm Period [authors' italics]." They also say "there is evidence of a more recent period of advance, of at least 150 meters" that "occurred later than the 14th century in a time interval possibly corresponding to the Little Ice Age (16th-19th centuries)." Last of all, they state that "at present, the glacier appears to be in slight regression (as much as several tens of meters), as is documented by the ice-core moraines which locally face its frontal and lateral margins." From these observations we conclude that the Medieval Warm Period of AD 900-1300 was more substantial than the Current Warm Period to date.