BBC: Man-made pollution is raising ocean acidity at least 10 times faster than previously thought, a study says. Researchers say carbon dioxide levels are having a marked effect on the health of shellfish such as mussels. They sampled coastal waters off the north-west Pacific coast of the US every half-hour for eight years. The results, published in the journal PNAS, suggest that earlier climate change models may have underestimated the rate of ocean …