The Montreal Protocol on Substances that Deplete the Ozone Layer is a Protocol to the UNEP Vienna Convention for the Protection of the Ozone Layer. The Montreal Protocol is in force, sufficient states have ratified. In the EU bloc, the Montreal Protocol is given effect by an existing EU Regulation on Ozone Depleting Substances. In addition, a separate EU Regulation regulates Fluorinated Greenhouse Gases (F-gases).
The Kigali Amendment is specifically focussed on the global phasedown of hydrofluorocarbons (HFCs) – powerful greenhouse gases. HFCs account for 85% of present F-gas supply. UNEP has a FAQ here.
HFCs, used mainly in refrigeration, air conditioning and heat pump equipment, are thousands of times more harmful to the climate than CO2. In response to the rapid growth of HFC emissions, the 197 parties to the Montreal Protocol adopted the Kigali Amendment in 2016 to reduce gradually their global production and consumption.
The EU has been phasing down HFCs since 2015 (and has a separate EU Regulation on the matter). EU Member States are in the process of ratifying the Kigali Amendment individually.
All 197 Montreal Protocol parties agreed to take steps to gradually reduce the production and use of HFCs. The first reduction step to be taken by the EU and other developed countries is required in 2019, while most developing countries will start their phasedown in 2024.
The Kigali Amendment will enter into force on 1 January 2019.
Montreal Protocol parties continue to ratify the Amendment, which has so far been ratified by 60 parties. The parties, listed alphabetically, are: Austria, Australia, Barbados, Belgium, Benin, Bulgaria, Burkina Faso, Canada, Chile, Comoros, Costa Rica, Côte d’Ivoire, Czech Republic, Democratic People’s Republic of Korea, Ecuador, Estonia, European Union, Finland, France, Gabon, Germany, Greece, Grenada, Guinea Bissau, Hungary, Ireland, Kiribati, Lao People’s Democratic Republic, Latvia, Lithuania, Luxembourg, Malawi, Maldives, Mali, Marshall Islands, Mexico, Micronesia (Federated States of), Netherlands, Niger, Niue, Norway, Palau, Panama, Paraguay, Portugal, Rwanda, Samoa, Senegal, Slovakia, Sri Lanka, Sweden, Switzerland, Togo, Tonga, Trinidad and Tobago, Tuvalu, Uganda, United Kingdom of Great Britain and Northern Ireland, Uruguay, Vanuatu.
A useful assessment of the EU F-gas regulation dating March 2018 is here.
This highlights the further changes mandated by the Kigali Amendment to implement a HFC licensing system.
BREXIT : the UK has ratified the Kigali Amendment
US : the US has not yet ratified the Kigali Amendment
China : China has not yet ratified the Kigali Amendment