This is a legally binding agreement between the signatories. The Montreal Protocol provides for a separate regime for developing countries.  January 3, 2019: The Kigali amendment to the Montreal Protocol on Ozone Depleting Substances came into force on January 1, 2019, after ratification by 65 countries. The United Nations Environment Programme (UNEP) announced its entry into force and said it would help reduce the production and consumption of hydrofluorocarbons (HFCs), greenhouse gases (GHGs) and thus prevent global warming by up to 0.4oC this century. The Kigali amendment to the Montreal Protocol is an international agreement to gradually reduce the consumption and production of hydrofluorocarbons (HFCs). The amendment was accepted at the 28th meeting of the parties to the Montreal Protocol in Kigali on October 15, 2016. In Decision XXVIII/1, they adopted an amendment to the protocol (the Kigali amendment).  The need for this change is due to the 1987 Montreal Protocol, which controls ozone-depleting substances. Because CFCs have been used as an alternative to ozone-depleting substances in refrigeration facilities, their role in global warming has become a major problem. In 2016, the parties to the Montreal Protocol adopted the CFC Convention concluding the 28th Meeting of the Parties (MOP 28) in Kigali, Rwanda. Governments have agreed that it will come into force on January 1, 2019, provided that at least 20 parties to the Montreal Protocol have ratified it.
On 17 November 2017, Sweden and Trinidad and Tobago tabled their ratification instruments, exceeding the required threshold. Under the amendment, all countries will gradually reduce HFCs by more than 80% over the next 30 years and replace them with more environmentally friendly alternatives. A certain group of industrialized countries will begin to gradually become debt-ridted in 2019. Several developing countries will freeze consumption of CFCs in 2024, followed by other countries in 2028. The schedule for progressive planning is detailed here. The amendment also contains agreements on CFC destruction technologies, data reporting requirements and capacity-building provisions for developing countries. [UNEP press release] Nairobi, 14 July 2020 – The Kigali amendment to the Montreal Protocol, an international agreement to reduce the use of hydrofluorocarbons (HFCs), has reached an important milestone: Liberia is the 100th country to ratify the amendment and provide a welcome boost to the global fight against climate change. The Kigali agreement is important because it addresses the crucial issue of CFCs. CFCs are powerful greenhouse gases and, to mitigate climate change, countries must strive to reduce their production and use and phase out them.