What evidence suggests that ocean acidification is happening and that it results from human activity?
Scientists have collected semi-continuous records of seawater pCO2 and pH over the last 20-30 years in the Pacific and Atlantic Oceans. These time-series records from near Hawaii, Bermuda, and the Canary Islands show that seawater pCO2 is mirroring the increase in atmospheric CO2 and that ocean pH is decreasing. Other measurements of the CO2 content in the North Pacific Ocean, conducted in 1991 and again in 2006, show that the CO2 content in the North Pacific Ocean has increased in accordance with rising atmospheric CO2 concentrations.
