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The Kigali Amendment to the Montreal Protocol is an international agreement to gradually reduce the consumption and production of hydrofluorocarbons (HFCs). It is a legally binding agreement designed to create rights and obligations in international law.
The Montreal Protocol was originally created to preserve and restore the ozone layer; participating countries agreed to phase out chlorofluorocarbons (CFCs), gases that had been causing ozone depletion. HFCs do not contain chlorine, so they do not cause ozone depletion, and therefore have been replacing CFCs under the Protocol. However, HFCs are powerful that contribute to climate change, so this amendment adds HFCs to the list of chemicals that countries promise to phase down.
, 163 states and the European Union have ratified the Kigali Amendment.
Originally, chlorofluorocarbons (CFCs) were used in these applications, but the deleterious effect of these gases on the ozone layer was revealed in 1974 by Paul J. Crutzen, Mario Molina, and F. Sherwood Rowland. The Montreal Protocol was signed in 1987 by the 20 major CFC producers and came into effect in 1989; since 1987, all 197 member states of the United Nations, among others, have ratified the Protocol. HFCs have since largely replaced CFCs. Although HFCs are harmless to the ozone layer, they are potent . While their lifespan in the atmosphere is short (10 to 20 years) relative to carbon dioxide (), HFCs filter infrared radiation much more powerfully. HFCs are therefore thousands of times more heat-trapping than , with a 100 year global warming potential (GWP) between 12 on the low end and 14,800 on the high end. For comparison, the GWP of carbon dioxide is 1. Eliminating emissions of these gases could significantly lower the effects of global warming and avoid a full 0.5 degree Celsius of warming above preindustrial levels by the end of the century.
The first group, which includes the "old" industrialized countries, is committed to reducing the use of HFCs by 45% by 2024 and by 85% by 2036, compared to their use between 2011 and 2013. A second group, which includes China, India and Brazil, is committed to reducing its consumption by 80% by 2045. Finally, this deadline is extended to 2047 for the rest of the countries, including India and a number of countries in the Middle East,"The decision and its annex state that Bahrain, India, Iran, Iraq, Kuwait, Oman, Pakistan, Qatar, Saudi Arabia, and the UAE will use a baseline averaging their calculated levels of HFC consumption for the years 2024, 2025, and 2026, plus 65% of their baseline consumption of HCFCs." Earth Negotiations Bulletin (PDF). p10. which are large consumers of air conditioning.
In addition, parties that experience monthly average temperatures over for at least two months per year, over a period of 10 consecutive years, may request a waiver. Although Denmark approved the amendment, Greenland is excluded.
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