CFCs were developed in the early 1930s and received little interruption due to their demand. I guess 1973 would be when we identified chlorofluorocarbons as something dangerous; we discovered that chlorine catalytic agent in ozone destruction.
I’m not sure whether you meant when chlorofluorocarbons (CFCs) were first used, or when they where first identified as environmentally hazardous. Just to cover both bases:
Chlorofluorocarbons were first invented in 1928, primarily for use in refrigeration. The first Chlorofluorocarbon invented was CFC-12, and the gases entered mass-market production in the 1930s, used in everything from cars to aerosol sprays.
It was not until 1974, however, that the ability of CFCs to “catalytically breakdown Ozone” was first recognized, in a study by the two scientists M.J. Molina and F.S. Rowland (see NASA link below). Based on the study, which predicted that continued use of CFCs would deplete as much as 7% of the ozone layer within 60 years, in 1978 aerosol sprays containing CFCs were banned in the US.
So, in 1928 CFCs were first invented, and in 1974 CFCs were identified as being bad for the ozone. For more information on both, including current, international regulation of CFCs, see both links below.
Click here to cancel reply.
Sorry,At this time user registration is disabled. We will open registration soon!
Don't have an account? Click Here to Signup
© Copyright GreenAnswers.com LLC