How does rising atmospheric CO2 affect marine organisms?

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Kiktiha Swamp, Shahdol District, Central India
Chauhan, M.S. and Quamar, M.F. 2010. Vegetation and climate change in southeastern Madhya Pradesh during late Holocene, based on pollen evidence. Journal of the Geological Society of India 76: 143-150.

Working with a 2-m-long sediment core retrieved from the Kiktiha Swamp of Central India (~23°N, 84°E), Chauhan and Quamar were able to develop temporal distributions of many types of plants that allowed them to identify three major climatic regimes that held sway there over the past 1650 years. The first of these regimes was described by the two researchers as "a warm and moist climate," which "supported tropical deciduous Sal forests." This interval, as they describe it, "corresponds with the period of the Medieval Warm Period, which is known between AD 740 and 1150 (Lamb, 1977)." The second regime lasted from about AD 1250 to 1650; and they say it was mostly a "period of harsh climate" that "falls within the temporal range of [the] Little Ice Age." And it was followed by the third regime, another warm period that has now persisted for three centuries and resulted in "the revival of modern Sal forests." Based on what is presented in Chauhan and Quamar's paper, however, it is not possible to determine which of the two warm periods may have been the warmest.

Additional Reference
Lamb, H.H. 1977. Climate: Present, Past and Future. Methuen, London.