How does rising atmospheric CO2 affect marine organisms?

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Still Melting After All These Years
Anderson, J.B. and Andrews, J.T.  1999.  Radiocarbon constraints on ice sheet advance and retreat in the Weddell Sea, Antarctica.  Geology 27: 179-182.

What was done
Radiometric dating, grain size and foraminiferal analyses were conducted on sediment cores collected from the eastern Weddell Sea continental shelf and the western Weddell Sea deep-sea floor in an attempt to better understand the dynamics of East and West Antarctic ice sheet behavior.

What was learned
In the words of the authors, "the combined data indicate that significant deglaciation of the Weddell Sea continental shelf took place prior to the last glacial maximum" and that the ice masses that border the Weddell Sea today "are more extensive than they were during the previous glacial minimum."

What it means
Again in the words of the authors, their data imply "that the current interglacial setting is characterized by a more extensive ice margin and larger ice shelves than existed during the last glacial minimum, and that the modern West and East Antarctic ice sheets have not yet shrunk to their minimum."  Hence, it is to be expected, independent of what global air temperature may currently be doing, because of the great inertial forces at work over much longer time scales, that the modern East and West Antarctic ice sheets will continue to shrink and release more icebergs to the Southern Ocean over the coming years, decades and centuries, thereby raising global sea level.  Nothing man has done is responsible for these phenomena; and nothing man can do will impact them in any way.

Reviewed 15 December 1999