USA put up a ban on CFCs in aerosol cans in 1978
20 nations signed the Vienna Convention for the Protection of the Ozone Layer in 1985
43 nations signed theMontreal Protocol on Substances that Deplete the Ozone Layerin 1987 to eventually phase out CFCs
DuPont discontinued the production of CFC in 1993
CFCs were replaced by hydrochlorofluorocarbons(HCFCs –still ODS) and hydrofluorocarbons(HFCs –no ODS but potent greenhouse gases)