Hours after being born, oysters are already working to form their protective, chalk-layered shells. Drawing calcium and carbonate from seawater, they combine the two to form hardened shells. But as humans have pumped voluminous sums of carbon dioxide into the atmosphere, this ancient process has come under threat. It’s estimated that the global ocean absorbs … Continue reading Acid test: Are the world’s oceans becoming too ‘acidic’ to support life?