>Source? My impression was that alternatives were already being developed prior to widespread ban. A quick wikipedia search confirms this. The montreal protocol

>Source? My impression was that alternatives were already being developed prior to widespread ban. A quick wikipedia search confirms this. The montreal protocol was signed in 1987 and came into effect in 1989, but by that time alternatives already existed. The Montreal Protocol was signed in '87 but things had been underway since the 70s, including a partial ban on aerosols in in US in '78. DuPont saw the writing on the wall. "In 1976 the United States National Academy of Sciences released a report concluding that the ozone depletion hypothesis was strongly supported by the scientific evidence. In response the United States, Canada and Norway banned the use of CFCs in aerosol spray cans in 1978." https://en.wikipedia.org/wiki/Ozone_depletion#Rowland-Molina_hypothesis https://en.wikipedia.org/wiki/Ozone_depletion#Rowland-Molina...