NOAA (National Oceanic & Atmospheric Administration, US) report about changes in the chemistry of the oceans when they absorb more and more CO2. Corals and other marine organisms that produce calcium carbonate skeletal structures will suffer when the oceans become more acidic.
Oceans have already absorbed approximately 118 billion metric tons of carbon between 1800 and 1994 produced by burning oil and coal.
This is leading to the most dramatic changes in marine chemistry in at least the past 650,000 years.
[Richard Feely, oceanographer, PMEL]
High bandwidth version of the report:
Impacts of Ocean Acidification on Coral Reefs and Other Marine Calcifiers Report
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