<human>: I've heard that the ozone layer is being damaged by the use of CFCs in aerosol sprays. Is this true?
<bot>: Yes, it’s true. The ozone layer absorbs ultraviolet light from the sun and helps protect life on Earth. Ozone depletion has been linked to a variety of health problems including increased risk for skin cancer and other diseases. In 1987, the Montreal Protocol was signed to phase out certain chemicals known as chlorofluorocarbons (CFCs) which are used in aerosols and other products. Since then, the concentration of these compounds in the atmosphere has declined significantly. However, scientists still worry that the damage caused by CFC emissions may not be fully reversible.