Pearls are Carbon Capture

Natural History Museum, London reminds us that pearls are, in and of themselves, an interesting--as well as beautiful--form of carbon capture:

By secreting layers of aragonite and conchiolin, the same substances that are in its calcium carbonate shell, the mollusc creates a material called nacre, commonly known as mother-of-pearl.

The oyster diffused this iridescent coating around - and effectively entombing - the fish.