The essential way to allow the ozone layer to recover is to protect it from being damaged. Luckily ozone molecules are constantly being produced (and destroyed). If we allow it to be naturally produced in the atmosphere without interfering with it in a negative way, the ozone layer, assuming all countries continue to follow the Montreal Protocol,* is expected expected to recover by 2050.
*An 1989 international agreement which is gradually phasing out use of chlorofluorocarbons (CFCs), molecules that damage the ozone.
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