IN 1985 a gaping hole was found in the ozone layer above Antarctica. Two years later leaders from around the world signed the Montreal Protocol, a treaty to phase out the substances causing it, known as chlorofluorocarbons (CFCs), which were used in refrigeration and as propellants in products such as hairsprays and deodorants.

IN 1985 a gaping hole was found in the ozone layer above Antarctica. Two years later leaders from around the world signed the Montreal Protocol, a treaty to phase out the substances causing it, known as chlorofluorocarbons (CFCs), which were used in refrigeration and as propellants in products such as hairsprays and deodorants.