Although it’s always wise to apply sunscreen before heading to the beach, evidence suggests most sunscreens contain chemicals that can harm the development of corals and make them more prone to bleaching. When corals bleach, they essentially start to die because they’ve lost the algae they rely on to produce food. For that reason, the city government of Key West in Florida has banned the sale of sunscreens that contains the ingredients that cause coral bleaching. The Key West is home to the only shallow-water reefs off the coast of the continental United States, which makes this ban especially pertinent. Now the Florida Senate is considering a similar bill that will ban certain harmful sunscreens across the state.