Oceans Ten Times More Acidic Than Thought

In PNAS this week:
Dynamic patterns and ecological impacts of declining
ocean pH in a high-resolution multi-year dataset

Increasing global concentrations of atmospheric CO2 are predicted to decrease ocean pH, with potentially severe impacts on marine food webs.....
....Our results indicate that pH decline is proceeding at a more rapid rate than previously predicted in some areas, and that this decline has ecological consequences for near shore benthic ecosystems.

Or read the National Geographic summary.