Emissions of substances that deplete the ozone layer have fallen by more than 99% since 1989Esteban Ortiz-Ospina
In 1987, countries around the world signed the Montreal Protocol to reduce emissions of ozone-depleting substances — such as chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and halon gases used in refrigerators, deodorants, and other industrial processes.