Though ocean acidification and corals have been a concern, not all coral reefs are at risk. Instead, some thrive as they have absorbed atmospheric carbon dioxide (CO2
) released by the burning of fossil fuels.
In ocean acidification, the CO2
reacts with water molecules, lowering ocean pH (making it more acidic), and that process also removes carbonate, an essential ingredient needed by corals and other organisms to build their skeletons and shells.
World Oceans Day today has meant new questions about ocean acidification, which threatens coral reef ecosystems worldwide - but not all reefs.