les gaz #CFC, je croyais que c etait fini
j'apprend que non.
ils pensent arreter de les utiliser en 2050
Avec le réchauffement climatique qui va en s'accélérant et la demande énorme en climatiseur pour lutter contre la température excessive de l'atmosphere qui va en s'accélérant....on ENCORE une fois de plus entrain de couper la branche sur laquelle on est.
CFCs, once released into the atmosphere, accumulate in the stratosphere, where they contribute to the depletion of the ozone layer. Stratospheric ozone shields life on Earth from the harmful effects of the Sun’s ultraviolet radiation
Ultraviolet radiation in the stratosphere causes the CFC molecules to dissociate, producing chlorine atoms and radicals (i.e., chlorodifluoromethyl radical; free radicals are species that contain one or more unpaired electrons).
The chlorine atoms then react with ozone, initiating a process whereby a single chlorine atom can cause the conversion of thousands of ozone molecules to oxygen.
Because of a growing concern over stratospheric ozone depletion and its attendant dangers, a ban was imposed on the use of CFCs in aerosol-spray dispensers in the late 1970s by the United States, Canada, and the Scandinavian countries. In 1990, 93 nations agreed, as part of the Montreal Protocol (established 1987), to end production of ozone-depleting chemicals by the end of the 20th century. By 1992 the list of participating countries had grown to 140, and the timetable for ending production of CFCs advanced to 1996. This goal has largely been met.
HCFCs pose less of a risk than CFCs because they decompose more readily in the lower atmosphere; nevertheless, they too degrade the ozone layer and are scheduled to be phased out by 2030.
https://www.britannica.com/science/chlorofluorocarbon
https://gml.noaa.gov/hats/publictn/elkins/cfcs.html
https://fr.wikipedia.org/wiki/Chlorofluorocarbure (fr)
https://www.bbc.com/future/article/20220321-what-happened-to-the-worlds-ozone-hole
#climat #terre #ozone #atmosphere #rechauffement #onvatouscrever #Chlorofluorocarbon #HCFC
