How does rising atmospheric CO2 affect marine organisms?

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A Big Chunk of Eastern China
Ge, Q., Zheng, J., Fang, X., Man, Z., Zhang, X., Zhang, P. and Wang, W.-C. 2003. Winter half-year temperature reconstruction for the middle and lower reaches of the Yellow River and Yangtze River, China, during the past 2000 years. The Holocene 13: 933-940.

Working with 200 different sets of phenological and meteorological records extracted from a number of historical sources, Ge et al. produced a 2000-year history of winter half-year temperature (October to April) for the region of China bounded by latitudes 27 and 40N and longitudes 107 and 120E. This effort revealed that following the Dark Ages Cold Period, "temperature entered a warm epoch from the AD 570s to 1310s," when peak warmth "was about 0.3-0.6C higher than present for 30-year periods, but over 0.9C warmer on a 10-year basis," after which the cooling that led to the Little Ice Age commenced. Most recently, Ge et al. report that "temperature has been rising rapidly during the twentieth century, especially for the period 1981-99." However, they find that the current mean temperature is only "0.5C higher than for 1951-80." Hence, it can be appreciated that for the big chunk of China Ge et al. studied, the 10-year-mean peak MWP warmth was approximately 0.4C higher than today's peak warmth.