Corals changed by CO₂

Norwegian corals have changed their appearance and structure over the last hundred years. That’s what scientists at the NTNU Museum of Natural History and Archaeology found when they compared specimens from the museum’s coral collection, which has been assembled over several generations.

Researchers think that the changes can be explained by a more acidic ocean – which is due to an increase in the amount of CO2 being absorbed by the ocean compared to past decades.