One common chemical in sunscreen can have devastating effects on coral reefs. Now, scientists know why.

Sea anemones, which are closely related to corals, and mushroom coral can turn oxybenzone — a chemical that protects people against ultraviolet light — into a deadly toxin that’s activated by light.

we let tourists buy sunscreen containing this then dump them in groups of 40 to snorkel right on our coral reefs.

We can prevent this by banning all sunscreen that contains this.