Read here. Contrary to the AGW alarmist predictions that ocean warming and "acidification" will harm sea life, eight sea biology experts found otherwise. Byrne et al. studied the impact on intertidal and shallow subtidal echinoids (sea urchins, sand dollars, starfish, sea snails and etc.) and determined that neither lower pH nor greater warmth had any material impact on the reproduction of these species.
In a word, the researchers found these marine invertebrates "robust" to negative impacts.
"Byrne et al. examined the interactive effects of near-future (ca. AD 2070-2100) ocean warming (temperature increases of 2-6°C) and ocean acidification (pH reductions of 0.2-0.6) on fertilization in four intertidal and shallow subtidal echinoids.....in the words of the eight researchers, "there was no significant effect of warming and acidification on the percentage of fertilization.".....say their results indicate that "fertilization in these species is robust to temperature and pH/PCO2 fluctuation,".....suggests that other marine fauna in still other circumstances may likewise be capable of adapting to any warming and acidification that might possibly develop throughout the world's oceans during the remaining decades of the 21st century." [Byrne, M., Soars, N.A., Ho, M.A., Wong, E., McElroy, D., Selvakumaraswamy, P., Dworjanyn, S.A. and Davis A.R. 2010: Marine Biology]
Additonal species-threat and peer-reviewed postings. Ocean-acidification postings here.