How does rising atmospheric CO2 affect marine organisms?

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Badanital Lake, Rudraprayag District, Garhwal Himalaya, India
Kotlia, B.S. and Joshi, L.M. 2013. Late Holocene climatic changes in Garhwal Himalaya. Current Science 104: 911-919.

Working with a 3.55-meter-long sediment core extracted from Badanital Lake (30°29'50"N, 78°55'26"E) in the Garhwal Himalaya of India, the authors found what they describe as "the imprints of four major global events," namely, the "4.2 ka event, Medieval Warm Period (MWP), Little Ice Age (LIA) and modern warming," based upon measurements and analyses they made of "major oxides and their ratios (CaO/MgO, CaO/TiO2, MgO/TiO2, Na2O/TiO2, TiO2/Al2O3, Na2O/K2O and Fe2O3/TiO2), major elements, chemical index of weathering, chemical index of alteration and loss on ignition." And they report that the MWP "prevailed around 920-440 years BP," concluding that their work "adds to the growing evidence for the global extent of these events."