How does rising atmospheric CO2 affect marine organisms?

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French Alps
Corona, C., Edouard, J.-L., Guibal, F., Guiot, J., Bernard, S., Thomas, A. and Denelle, N. 2010. Long-term summer (AD 751-2008) temperature fluctuation in the French Alps based on tree-ring data. Boreas 40: 351-366.

Working with tree-ring width data obtained from 548 trees (living and dead) at 34 different sites distributed across the French Alps (44°-45°30'N, 6°30'-7°45'E), which they calibrated against monthly homogenized records of temperature obtained from a network of 134 meteorological stations extending back to AD 1760, Corona et al. developed a summer (June, July, August) temperature history for the period AD 751-2008 using the Regional Curve Standardization technique, which they say "has been shown to be the most appropriate age-related detrending method for preserving multi-centennial climate variability." This work revealed, in their words, that "most of the 20th century is comparable with the Medieval Warm Period," but they say that "during the last decade of the 20th century, the amplitude and abruptness of the summer temperature increase exceed the warming reconstructed for the Medieval Warm Period." And from their graph of the data, that exceedance appears to be about 0.4°C.