“[...] the Amendment shall enter
into force on 1 January 2019, provided
that at least twenty instruments of ratification,
acceptance or approval of the Amendment have been deposited by States or regional
economic integration organizations that are
Parties to the Montreal Protocol on Substances that Deplete
the Ozone Layer. In the event that this
condition has not been fulfilled by that date, the Amendment shall enter
into force on the ninetieth day following the date on which it has been fulfilled.”