How does rising atmospheric CO2 affect marine organisms?

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Tagus River Estuary, off Lisbon, Portugal
Abrantes, F., Lebreiro, S., Rodrigues, T., Gil, I., Bartels-Jónsdóttir, H., Oliveira, P., Kissel, C. and Grimalt, J.O. 2005. Shallow-marine sediment cores record climate variability and earthquake activity off Lisbon (Portugal) for the last 2000 years. Quaternary Science Reviews 24: 2477-2494.

Sea surface temperatures, river discharge and biological productivity were reconstructed in a multi-proxy analysis of a high-resolution sediment core obtained from the Tagus River estuary near Lisbon, Portugal (~ 38.56°N, 9.35°W). The MWP was identified as occurring between AD 550 and 1300, during which time interval mean sea surface temperatures were between 1.5 and 2°C higher than the mean value of the past century, while peak MWP warmth was about 0.9°C greater than late 20th-century peak warmth.