Montreal Protocol
the Montreal protocol on substances That Deplete the Ozone Layer. is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances and gases believed to be responsible for ozone depletion.
The treaty was opened for signature on September 16, 1987, and entered into force on January 1, 1989, followed by a first meeting in Helsinki, May 1989. Since then, it has undergone seven revisions, in 1990 (London), 1991 (Nairobi), 1992 (Copenhagen), 1993 (Bangkok), 1995 (Vienna), 1997 (Montreal), and 1999 (Beijing). It is believed that if the international agreement is adhered to, the ozone layer is expected to recover by 2050.
my openion is that it's working see image and by 2050 it's expected to be good as new.
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