How does rising atmospheric CO2 affect marine organisms?

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Lake Ximencuo, Nianbaoyeze Mountains, Eastern Tibetan Plateau
Mischke, S. and Zhang, C. 2010. Holocene cold events on the Tibetan Plateau. Global and Planetary Change 72: 155-163.

Working with a sediment core they extracted from Lake Ximencuo (33.38°N, 101.10°E), which is located in a valley on the northern slope of the Nianbaoyeze Mountains of the eastern Tibetan Plateau, Mischke and Zhang employed multi-proxy geochemical, sedimentological and magnetic analyses, together with age determination via 14C AMS dating, in an assessment of the Holocene climate history of that particular part of the world; and in doing so, they identified six "cold events," the last two of which held sway from approximately AD 300 to 700 and AD 1400 to 1900. Therefore, by definition, there was a "warm event" that prevailed from about AD 700 to 1400, which fits the temporal location of the Medieval Warm Period almost perfectly (See our Interactive Map and Time Domain Plot.)