Explanation:

1, 2, and 3

• In 1985, the Vienna Convention for the Protection of the Ozone Layer formalized international cooperation on this issue. This cooperation resulted in the signing of the Montreal Protocol on Substances that Deplete the Ozone Layer in 1987.

• The London Amendment (1990) changed the ODS emission schedule

• The Copenhagen Amendment (1992) significantly accelerated the phase out of ODSs and incorporated an hydrochlorofluorocarbons (HCFC) phaseout for developed countries,

• The Montreal Amendment (1997) included the phaseout of HCFCs in developing countries,

• The Beijing Amendment (1999) included tightened controls on the production and trade of HCFCs.

• The Kigali Amendment (2016)extended controls to phase down the production and consumption of hydrofluorocarbons (HFCs)