Montreal Protocol

The Montreal Protocol is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion. It was agreed on 16 September 1987, and entered into force on 1 January 1989. Since then, it has undergone nine revisions, in 1990 (London), 1991 (Nairobi), 1992 (Copenhagen), 1993 (Bangkok), 1995 (Vienna), 1997 (Montreal), 1998 (Australia), 1999 (Beijing) and 2016 (Kigali)^[1][2][3] As a result of the international agreement, the ozone hole in Antarctica is slowly recovering.^[4] Climate projections indicate that the ozone layer will return to 1980 levels between 2040 (across much of the world) and 2066 (over Antarctica).^[5][6][7] Due to its widespread adoption and implementation, it has been hailed as an example of successful international co-operation. Former UN Secretary-General Kofi Annan stated that "perhaps the single most successful international agreement to date has been the Montreal Protocol".^[8][9] In comparison, effective burden-sharing and solution proposals mitigating regional conflicts of interest have been among the success factors for the ozone depletion challenge, where global regulation based on the Kyoto Protocol has failed to do so.^[10] In this case of the ozone depletion challenge, there was global regulation already being installed before a scientific consensus was established. Also, overall public opinion was convinced of possible imminent risks.^[11][12]

Montreal Protocol

The Montreal Protocol on Substances That Deplete the Ozone Layer
Signed	16 September 1987
Location	Montreal
Effective	1 January 1989 if 11 states have ratified by then.
Condition	Ratification by 20 states
Signatories	46
Ratifiers	198 (all United Nations members, as well as the Cook Islands, Niue, the Holy See, the State of Palestine and the European Union)
Depositary	Secretary-General of the United Nations
Languages	Arabic, Chinese, English, French, Russian, and Spanish.

The largest Antarctic ozone hole recorded as of September 2006

Retrospective video on the Montreal Protocol and the collaboration between policy-makers, scientists, and industry leaders to regulate CFCs.

The two ozone treaties have been ratified by 198 parties (197 states and the European Union),^[13] making them the first universally ratified treaties in United Nations history.^[14]

These truly universal treaties have also been remarkable in the expedience of the policy-making process at the global scale, where only 14 years lapsed between a basic scientific research discovery (1973) and the international agreement signed (1985 and 1987).

Terms and purposes

The treaty^{[Notes 1]} is structured around several groups of halogenated hydrocarbons that deplete stratospheric ozone. All of the ozone depleting substances controlled by the Montreal Protocol contain either chlorine or bromine (substances containing only fluorine do not harm the ozone layer). Some ozone-depleting substances (ODSs) are not yet controlled by the Montreal Protocol, including nitrous oxide (N₂O) For a table of ozone-depleting substances controlled by the Montreal Protocol see:^[15]

For each group of ODSs, the treaty provides a timetable on which the production of those substances must be reduced and eventually eliminated. This includes a 10-year phase-out for developing countries^[16] identified in Article 5 of the treaty.

Chlorofluorocarbons (CFCs) Phase-out Management Plan

The stated purpose of the treaty is that the signatory states

Recognizing that worldwide emissions of certain substances can significantly deplete and otherwise modify the ozone layer in a manner that is likely to result in adverse effects on human health and the environment. Determined to protect the ozone layer by taking precautionary measures to control equitably total global emissions of substances that deplete it with the ultimate objective of their elimination on the basis of developments in scientific knowledge

Acknowledging that special provision is required to meet the needs of developing countries

shall accept a series of stepped limits on CFC use and production, including:

• from 1991 to 1992 its levels of consumption and production of the controlled substances in Group I of Annex A do not exceed 150 percent of its calculated levels of production and consumption of those substances in 1986;
• from 1994 its calculated level of consumption and production of the controlled substances in Group I of Annex A does not exceed, annually, twenty-five percent of its calculated level of consumption and production in 1986.
• from 1996 its calculated level of consumption and production of the controlled substances in Group I of Annex A does not exceed zero.

There was a faster phase-out of halon-1211, -2402, -1301, There was a slower phase-out (to zero by 2010) of other substances (halon 1211, 1301, 2402; CFCs 13, 111, 112, etc.)^{[contradictory]} and some chemicals were given individual attention (Carbon tetrachloride; 1,1,1-trichloroethane). The phasing-out of the less damaging HCFCs only began in 1996 and will go on until a complete phasing-out is achieved by 2030.

There were a few exceptions for "essential uses" where no acceptable substitutes were initially found (for example, in the past metered dose inhalers commonly used to treat asthma and chronic obstructive pulmonary disease were exempt) or Halon fire suppression systems used in submarines and aircraft (but not in general industry).

The substances in Group I of Annex A are:

• CFCl₃ (CFC-11)
• CF₂Cl₂ (CFC-12)
• C₂F₃Cl₃ (CFC-113)
• C₂F₄Cl₂(CFC-114)
• C₂F₅Cl (CFC-115)

The provisions of the Protocol include the requirement that the Parties to the Protocol base their future decisions on the current scientific, environmental, technical, and economic information that is assessed through panels drawn from the worldwide expert communities. To provide that input to the decision-making process, advances in understanding on these topics were assessed in 1989, 1991, 1994, 1998 and 2002 in a series of reports entitled Scientific assessment of ozone depletion, by the Scientific Assessment Panel (SAP).^[17]

In 1990 a Technology and Economic Assessment Panel was also established as the technology and economics advisory body to the Montreal Protocol Parties.^[18] The Technology and Economic Assessment Panel (TEAP) provides, at the request of Parties, technical information related to the alternative technologies that have been investigated and employed to make it possible to virtually eliminate use of Ozone Depleting Substances (such as CFCs and Halons), that harm the ozone layer. The TEAP is also tasked by the Parties every year to assess and evaluate various technical issues including evaluating nominations for essential use exemptions for CFCs and halons, and nominations for critical use exemptions for methyl bromide. TEAP's annual reports are a basis for the Parties' informed decision-making.

Numerous reports have been published by various inter-governmental, governmental and non-governmental organizations to catalogue and assess alternatives to the ozone depleting substances, since the substances have been used in various technical sectors, like in refrigeration, air conditioning, flexible and rigid foam, fire protection, aerospace, electronics, agriculture, and laboratory measurements.^[19][20][21]

Hydrochlorofluorocarbons (HCFCs) Phase-out Management Plan (HPMP)

Under the Montreal Protocol on Substances that Deplete the Ozone Layer, especially Executive Committee (ExCom) 53/37 and ExCom 54/39, Parties to this Protocol agreed to set year 2013 as the time to freeze the consumption and production of HCFCs for developing countries. For developed countries, reduction of HCFC consumption and production began in 2004 and 2010, respectively, with 100% reduction set for 2020. Developing countries agreed to start reducing its consumption and production of HCFCs by 2015, with 100% reduction set for 2030.^[22]

Hydrochlorofluorocarbons, commonly known as HCFCs, are a group of human-made compounds containing hydrogen, chlorine, fluorine and carbon. They are not found anywhere in nature. HCFC production began to take off after countries agreed to phase out the use of CFCs in the 1980s, which were found to be destroying the ozone layer. Like CFCs, HCFCs are used for refrigeration, aerosol propellants, foam manufacture and air conditioning. Unlike the CFCs, however, most HCFCs are broken down in the lowest part of the atmosphere and pose a much smaller risk to the ozone layer. Nevertheless, HCFCs are very potent greenhouse gases, despite their very low atmospheric concentrations, measured in parts per trillion (million million).

The HCFCs are transitional CFCs replacements, used as refrigerants, solvents, blowing agents for plastic foam manufacture, and fire extinguishers. In terms of ozone depletion potential (ODP), in comparison to CFCs that have ODP 0.6–1.0, these HCFCs have lower ODPs (0.01–0.5). In terms of global warming potential (GWP), in comparison to CFCs that have GWP 4,680–10,720, HCFCs have lower GWPs (76–2,270).

Hydrofluorocarbons (HFCs)

On 1 January 2019 the Kigali Amendment to the Montreal Protocol came into force.^[23] Under the Kigali Amendment countries promised to reduce the use of hydrofluorocarbons (HFCs) by more than 80% over the next 30 years.^[24] By 27 December 2018, 65 countries had ratified the Amendment.^[25]

Produced mostly in developed countries, hydrofluorocarbons (HFCs) replaced CFCs and HCFCs. HFCs pose no harm to the ozone layer because, unlike CFCs and HCFCs, they do not contain chlorine. They are, however, greenhouse gases, with a high global warming potential (GWP), comparable to that of CFCs and HCFCs.^[26][27] In 2009, a study calculated that a fast phasedown of high-GWP HFCs could potentially prevent the equivalent of up to 8.8 Gt CO₂-eq per year in emissions by 2050.^[28] A proposed phasedown of HFCs was hence projected to avoid up to 0.5C of warming by 2100 under the high-HFC growth scenario, and up to 0.35C under the low-HFC growth scenario.^[29] Recognizing the opportunity presented for fast and effective phasing down of HFCs through the Montreal Protocol, starting in 2009 the Federated States of Micronesia proposed an amendment to phase down high-GWP HFCs,^[30] with the U.S., Canada, and Mexico following with a similar proposal in 2010.^[31]

After seven years of negotiations, in October 2016 at the 28th Meeting of the Parties to the Montreal Protocol in Kigali, the Parties to the Montreal Protocol adopted the Kigali Amendment whereby the Parties agreed to phase down HFCs under the Montreal Protocol.^[32] The amendment to the legally-binding Montreal Protocol will ensure that industrialised countries bring down their HFC production and consumption by at least 85 per cent compared to their annual average values in the period 2011–2013. A group of developing countries including China, Brazil and South Africa are mandated to reduce their HFC use by 85 per cent of their average value in 2020-22 by the year 2045. India and some other developing countries – Iran, Iraq, Pakistan, and some oil economies like Saudi Arabia and Kuwait – will cut down their HFCs by 85 per cent of their values in 2024-26 by the year 2047.

On 17 November 2017, ahead of the 29th Meeting of the Parties of the Montreal Protocol, Sweden became the 20th Party to ratify the Kigali Amendment, pushing the Amendment over its ratification threshold ensuring that the Amendment would enter into force 1 January 2019.^[33]

History

In the 1970s, the chemists Frank Sherwood Rowland and Mario Molina, who were then at the University of California, Irvine, began studying the impacts of CFCs in the Earth's atmosphere. They discovered that CFC molecules were stable enough to remain in the atmosphere until they got up into the middle of the stratosphere where they would finally (after an average of 50–100 years for two common CFCs) be broken down by ultraviolet radiation releasing a chlorine atom. Rowland and Molina then proposed that these chlorine atoms might be expected to cause the breakdown of large amounts of ozone (O₃) in the stratosphere. Their argument was based upon an analogy to contemporary work by Paul J. Crutzen and Harold Johnston, which had shown that nitric oxide (NO) could catalyze the destruction of ozone. (Several other scientists, including Ralph Cicerone, Richard Stolarski, Michael McElroy, and Steven Wofsy had independently proposed that chlorine could catalyze ozone loss, but none had realized that CFCs were a potentially large source of chlorine.) Crutzen, Molina and Rowland were awarded the 1995 Nobel Prize for Chemistry for their work on this problem.

The environmental consequence of this discovery was that, since stratospheric ozone absorbs most of the ultraviolet-B (UV-B) radiation reaching the surface of the planet, depletion of the ozone layer by CFCs would lead to an increase in UV-B radiation at the surface, resulting in an increase in skin cancer and other impacts such as damage to crops and to marine phytoplankton.

But the Rowland-Molina hypothesis was strongly disputed by representatives of the aerosol and halocarbon industries. The chair of the board of DuPont was quoted as saying that ozone depletion theory is "a science fiction tale...a load of rubbish...utter nonsense". Robert Abplanalp, the president of Precision Valve Corporation (and inventor of the first practical aerosol spray can valve), wrote to the Chancellor of UC Irvine to complain about Rowland's public statements (Roan, p. 56.)

After publishing their pivotal paper in June 1974, Rowland and Molina testified at a hearing before the U.S. House of Representatives in December 1974. As a result, significant funding was made available to study various aspects of the problem and to confirm the initial findings. In 1976, the U.S. National Academy of Sciences (NAS) released a report that confirmed the scientific credibility of the ozone depletion hypothesis.^[34] NAS continued to publish assessments of related science for the next decade.

Then, in 1985, British Antarctic Survey scientists Joe Farman, Brian Gardiner and Jon Shanklin published results of abnormally low ozone concentrations above Halley Bay near the South Pole. They speculated that this was connected to increased levels of CFCs in the atmosphere. It took several other attempts to establish the Antarctic losses as real and significant, especially after NASA had retrieved matching data from its satellite recordings. This unforeseen phenomenon in the Antarctic, as well as NASA's scientific images of the ozone hole played an important role in the Montreal Protocol negotiations.^[35] The impact of these studies, the metaphor 'ozone hole', and the colourful visual representation in a time lapse animation proved shocking enough for negotiators in Montreal, Canada to take the issue seriously.^[36]

 

TOMS satellite map showing the total ozone above the Antarctic region. Taken on 1 October 1983 (NASA)

 

Parties subscribed to the Montreal Protocol by region, 1987-2013

Also in 1985, 20 nations, including most of the major CFC producers, signed the Vienna Convention, which established a framework for negotiating international regulations on ozone-depleting substances.^[37] After the discovery of the ozone hole by SAGE 2 it only took 18 months to reach a binding agreement in Montreal, Canada. Mostafa Kamal Tolba, the head of the UNEP at the time, was considered the "father of the Montreal Protocol" for his role in bringing the nations together for an agreement.^[38]

But the CFC industry did not give up that easily. As late as 1986, the Alliance for Responsible CFC Policy (an association representing the CFC industry founded by DuPont) was still arguing that the science was too uncertain to justify any action. In 1987, DuPont testified before the US Congress that "We believe there is no imminent crisis that demands unilateral regulation."^[39] And even in March 1988, Du Pont Chair Richard E. Heckert would write in a letter to the United States Senate, "we will not produce a product unless it can be made, used, handled and disposed of safely and consistent with appropriate safety, health and environmental quality criteria. At the moment, scientific evidence does not point to the need for dramatic CFC emission reductions. There is no available measure of the contribution of CFCs to any observed ozone change..."^[40]

Multilateral Fund

The main objective of the Multilateral Fund for the Implementation of the Montreal Protocol is to assist developing country parties to the Montreal Protocol whose annual per capita consumption and production of ozone depleting substances (ODS) is less than 0.3 kg to comply with the control measures of the Protocol. Currently, 147 of the 196 Parties to the Montreal Protocol meet these criteria (they are referred to as Article 5 countries).

It embodies the principle agreed at the United Nations Conference on Environment and Development in 1992 that countries have a common but differentiated responsibility to protect and manage the global commons.

The Fund is managed by an executive committee with an equal representation of seven industrialized and seven Article 5 countries, which are elected annually by a Meeting of the Parties. The Committee reports annually to the Meeting of the Parties on its operations. The work of the Multilateral Fund on the ground in developing countries is carried out by four Implementing Agencies, which have contractual agreements with the executive committee:^[41]

• United Nations Environment Programme (UNEP), through its OzonAction Programme.
• United Nations Development Programme (UNDP).
• United Nations Industrial Development Organization (UNIDO).
• World Bank.

Up to 20 percent of the contributions of contributing parties can also be delivered through their bilateral agencies in the form of eligible projects and activities.

The fund is replenished on a three-year basis by the donors. Pledges amount to US$3.1 billion over the period 1991 to 2005. Funds are used, for example, to finance the conversion of existing manufacturing processes, train personnel, pay royalties and patent rights on new technologies, and establish national ozone offices.

Parties

As of October 2022, all Member States of the United Nations, the Cook Islands, Niue, the Holy See, the State of Palestine as well as the European Union have ratified the original Montreal Protocol (see external link below),^[42] with the State of Palestine being the last party to ratify the agreement, bringing the total to 198. 197 of those parties (with the exception of the State of Palestine) have also ratified the London, Copenhagen, Montreal, and Beijing amendments.^[13]

Effect

 

Ozone-depleting gas trends

Since the Montreal Protocol came into effect, the atmospheric concentrations of the most important chlorofluorocarbons and related chlorinated hydrocarbons have either leveled off or decreased.^[43] Halon concentrations have continued to increase, as the halons presently stored in fire extinguishers are released, but their rate of increase has slowed and their abundances are expected to begin to decline by about 2020. Also, the concentration of the HCFCs increased drastically at least partly because of many uses (e.g. used as solvents or refrigerating agents) CFCs were substituted with HCFCs. While there have been reports of attempts by individuals to circumvent the ban, e.g. by smuggling CFCs from undeveloped to developed nations, the overall level of compliance has been high. Statistical analysis from 2010 show a clear positive signal from the Montreal Protocol to the stratospheric ozone.^[44] In consequence, the Montreal Protocol has often been called the most successful international environmental agreement to date. In a 2001 report, NASA found the ozone thinning over Antarctica had remained the same thickness for the previous three years,^[45] however in 2003 the ozone hole grew to its second largest size.^[46] The most recent (2006) scientific evaluation of the effects of the Montreal Protocol states, "The Montreal Protocol is working: There is clear evidence of a decrease in the atmospheric burden of ozone-depleting substances and some early signs of stratospheric ozone recovery."^[47] However, a more recent study seems to point to a relative increase in CFCs due to an unknown source.^[48]

Reported in 1997, significant production of CFCs occurred in Russia for sale on the black market to the EU throughout the 90s. Related US production and consumption was enabled by fraudulent reporting due to poor enforcement mechanisms. Similar illegal markets for CFCs were detected in Taiwan, Korea, and Hong Kong.^[49]

The Montreal Protocol is also expected to have effects on human health. A 2015 report by the U.S. Environmental Protection Agency estimates that the protection of the ozone layer under the treaty will prevent over 280 million cases of skin cancer, 1.5 million skin cancer deaths, and 45 million cataracts in the United States.^[50]

However, the hydrochlorofluorocarbons, or HCFCs, and hydrofluorocarbons, or HFCs, contribute to anthropogenic global warming.^[51] On a molecule-for-molecule basis, these compounds are up to 10,000 times more potent greenhouse gases than carbon dioxide. The Montreal Protocol currently calls for a complete phase-out of HCFCs by 2030, but does not place any restriction on HFCs. Since the CFCs themselves are equally powerful greenhouse gases, the mere substitution of HFCs for CFCs does not significantly increase the rate of anthropogenic climate change, but over time a steady increase in their use could increase the danger that human activity will change the climate.^[52]

Policy experts have advocated for increased efforts to link ozone protection efforts to climate protection efforts.^[53][54][55] Policy decisions in one arena affect the costs and effectiveness of environmental improvements in the other.

Regional detections of non-compliance

In 2018, scientists monitoring the atmosphere following the 2010 phaseout date have reported evidence of continuing industrial production of CFC-11, likely in eastern Asia, with detrimental global effects on the ozone layer.^[56][57] A monitoring study detected fresh atmospheric releases of carbon tetrachloride from China's Shandong province, beginning sometime after 2012, and accounting for a large part of emissions exceeding global estimates under the Montreal Protocol.^[58]

25th anniversary celebrations

The year 2012 marked the 25th anniversary of the signing of the Montreal Protocol. Accordingly, the Montreal Protocol community organized a range of celebrations at the national, regional and international levels to publicize its considerable success to date and to consider the work ahead for the future.^[59] Among its accomplishments are: The Montreal Protocol was the first international treaty to address a global environmental regulatory challenge; the first to embrace the "precautionary principle" in its design for science-based policymaking; the first treaty where independent experts on atmospheric science, environmental impacts, chemical technology, and economics, reported directly to Parties, without edit or censorship, functioning under norms of professionalism, peer review, and respect; the first to provide for national differences in responsibility and financial capacity to respond by establishing a multilateral fund for technology transfer; the first MEA with stringent reporting, trade, and binding chemical phase-out obligations for both developed and developing countries; and, the first treaty with a financial mechanism managed democratically by an executive board with equal representation by developed and developing countries.^[60]

Within 25 years of signing, parties to the MP celebrate significant milestones. Significantly, the world has phased-out 98% of the Ozone-Depleting Substances (ODS) contained in nearly 100 hazardous chemicals worldwide; every country is in compliance with stringent obligations; and, the MP has achieved the status of the first global regime with universal ratification; even the newest member state, South Sudan, ratified in 2013. UNEP received accolades for achieving global consensus that "demonstrates the world’s commitment to ozone protection, and more broadly, to global environmental protection".^[61]

See also

•  Environment portal
•  Ecology portal
•  Global warming portal
•  Politics portal
•  World portal

• Action for Climate Empowerment
• Carbon footprint
• Copenhagen Accord
• Net capacity factor
• International Day for the Preservation of the Ozone Layer
• Paris Agreement
• R-134a
• Section 608
• Vienna Conference (1985)
• Fossil fuel phase-out
• Phase-out of fossil fuel vehicles
• Phase-out of gas boilers
• Plastic bans

Notes

1. The full terms of the Montreal Protocol are available from the United Nations Environment Programme (UNEP) Ozone Secretariat 3 July 2008 at the Wayback Machine

References

1. Hub, IISD's SDG Knowledge. "Kigali Amendment Enters into Force, Bringing Promise of Reduced Global Warming | News | SDG Knowledge Hub | IISD". Retrieved 7 March 2019.
2. McGrath, Matt (15 October 2016). "Deal reached on HFC greenhouse gases". BBC.
3. . United Nations Environment Programme Ozone Secretariat. Archived from the original on 23 August 2014. Retrieved 24 August 2014.
4. Ewenfeldt B, "Ozonlagret mår bättre", Arbetarbladet 12-9-2014, p. 10.
5. . UNEP. UNEP. 10 September 2014. Archived from the original on 13 September 2014. Retrieved 18 September 2014.
6. Susan Solomon; Anne R. Douglass; Paul A. Newman (July 2014). "The Antarctic ozone hole: An update". Physics Today. 67 (7): 42–48. Bibcode:2014PhT....67g..42D. doi:10.1063/PT.3.2449. hdl:1721.1/99159.
7. Canada, Environment and Climate Change (20 February 2015). "Ozone layer depletion: Montreal Protocol". aem. Retrieved 22 April 2020.
8. "The Ozone Hole-The Montreal Protocol on Substances that Deplete the Ozone Layer". Theozonehole.com. 16 September 1987.
9. "Background for International Day for the Preservation of the Ozone Layer - 16 September". un.org. Retrieved 28 May 2017.
10. Of Montreal and Kyoto: A Tale of Two Protocols 26 August 2014 at the Wayback Machine by Cass R. Sunstein 38 ELR 10566 8/2008
11. Environmental Politics Climate Change and Knowledge Politics 26 August 2014 at the Wayback Machine Reiner Grundmann, Vol. 16, No. 3, 414–432, June 2007
12. Technische Problemlösung, Verhandeln und umfassende Problemlösung, (eng. technical trouble shooting, negotiating and generic problem solving capability) 3 March 2016 at the Wayback Machine in Gesellschaftliche Komplexität und kollektive Handlungsfähigkeit (Societys complexity and collective ability to act), ed. Schimank, U. (2000). Frankfurt/Main: Campus, p.154-182 book summary at the Max Planck Gesellschaft 12 October 2014 at the Wayback Machine
13. . Ozone.unep.org. Archived from the original on 8 October 2014. Retrieved 10 March 2008.
14. . Unep.org. Archived from the original on 4 March 2016. Retrieved 11 July 2012.
15. . Epa.gov. 15 February 2013. Archived from the original on 11 May 2008. Retrieved 28 October 2006.
16. An Interview with Lee Thomas, EPA’s 6th Administrator. Video 22 September 2020 at the Wayback Machine, Transcript 12 April 2019 at the Wayback Machine (see p15). 19 April 2012.
17. . ozone.unep.org. Archived from the original on 24 April 2018. Retrieved 23 April 2018.
18. . ozone.unep.org. Archived from the original on 26 January 2018. Retrieved 23 April 2018.
19. Use of ozone depleting substances in laboratories. TemaNord 2003:516. http://norden.diva-portal.org/smash/get/diva2:796602/FULLTEXT01.pdf 21 November 2015 at the Wayback Machine
20. The Technical and Economic Feasibility of Replacing Methyl Bromide in Developing Countries. Friends of the Earth, Washington, 173 pp, 1996
21. Guidance on the DOE Facility Phaseout of Ozone-Depleting Substances. 1995. (PDF). Archived from the original (PDF) on 27 February 2008. Retrieved 3 December 2007.
22. "The Montreal Protocol on Substances that Deplete the Ozone Layer". United Nations Environment Programme. Retrieved 16 November 2018.
23. "Ozone Timeline | Ozone Secretariat". ozone.unep.org. Retrieved 22 April 2020.
24. Msuya, Joyce. "Kigali Amendment heralds new dawn for climate change action". The Standard. Retrieved 22 April 2020.
25. Msuya, Joyce (2 January 2019). "Kigali Amendment heralds new dawn for climate change action". The Standard. Retrieved 2 January 2019.
26. "Climate of irrationality". Down To Earth. 18 September 2012.
27. Canada, Environment and Climate Change (2 December 2008). "Ozone-depleting substances". aem. Retrieved 22 April 2020.
28. Velders GJ, Fahey DW, Daniel JS, McFarland M, Andersen SO (July 2009). "The large contribution of projected HFC emissions to future climate forcing". Proceedings of the National Academy of Sciences of the United States of America. 106 (27): 10949–54. Bibcode:2009PNAS..10610949V. doi:10.1073/pnas.0902817106. PMC 2700150. PMID 19549868.
29. Xu, Yangyang; Zaelke, Durwood; Velders, Guus J. M.; Ramanathan, V (1 June 2013). The role of HFCs in mitigating 21st century climate change. Vol. 13.
30. "Proposed amendment to the Montreal Protocol" (PDF). United Nations Environment Programme. 4 May 2009. Retrieved 17 May 2018.
31. "Proposed amendment to the Montreal Protocol" (PDF). United Nations Environment Programme. 30 July 2010. Retrieved 17 May 2018.
32. "Report of the Twenty-Eighth Meeting of the Parties to the Montreal Protocol on Substances that Deplete the Ozone Layer" (PDF). October 2016.
33. "Montreal Protocol celebrates another milestone as agreement to reduce climate-warming gases is set to enter into force in 2019". UN Environment. Retrieved 25 January 2018.
34. National Academy of Sciences (1976). Halocarbons, effects on stratospheric ozone. Washington, DC. ISBN 9780309025324.{{cite book}}: CS1 maint: location missing publisher (link)
35. Grevsmühl, Sebastian V.; Briday, Régis (2023). "Satellite images as tools of visual diplomacy: NASA's ozone hole visualizations and the Montreal Protocol negotiations". The British Journal for the History of Science. 56 (2): 247–267. doi:10.1017/S000708742300002X. PMID 36776108. S2CID 256825183.
36. Grundmann, Reiner, Transnational Environmental Policy: Reconstructing Ozone, London: Routledge, ISBN 0-415-22423-3
37. "The Vienna Convention for the Protection of the Ozone Layer | Ozone Secretariat". ozone.unep.org. Retrieved 22 April 2020.
38. "Dr. Mostafa Tolba, Father of Montreal Protocol, Dies at 93 - IGSD". Retrieved 28 September 2023.
39. Doyle, Jack (October 1991). "DuPont's Disgraceful Deeds: The Environmental Record of E.I. DuPont de Nemour". The Multinational Monitor. Vol. 12, no. 10. Retrieved 8 September 2014.
40. . Greenpeace. 1997. Archived from the original on 6 April 2012. Retrieved 8 September 2014.
41. Creating a real change for the environment. Secretariat of the Multilateral Fund for the Implementation of the Montreal Protocol. 2007.
42. "2. a Montreal Protocol on Substances that Deplete the Ozone Layer Montreal, 16 September 1987". United Nations. Retrieved 2 October 2022.
43. (PDF). Archived from the original (PDF) on 14 June 2006.
44. Mäder, J. A.; Staehelin, J.; Peter, T.; Brunner, D.; Rieder, H. E.; Stahel, W. A. (22 December 2010). "Evidence for the effectiveness of the Montreal Protocol to protect the ozone layer". Atmospheric Chemistry and Physics. 10 (24): 12161–12171. Bibcode:2010ACP....1012161M. doi:10.5194/acp-10-12161-2010. hdl:20.500.11850/27649.
45. . gsfc.nasa.gov. Archived from the original on 31 December 2009. Retrieved 16 September 2010.
46. "NOAA News Online (Story 2099)". noaanews.noaa.gov. Retrieved 16 September 2010.
47. Scientific Assessment of Ozone Depletion: 2006, http://www.esrl.noaa.gov/csd/assessments/2006/report.html 29 March 2010 at the Wayback Machine
48. "A Mystery Source is Producing Banned Ozone-Destroying Chemicals, Shocking Scientists". 16 May 2018.
49. Landers, Fredrick Poole (1997). "The Black Market Trade in Chlorofluorocarbons: The Montreal Protocol Makes Banned Refrigerants a Hot Commodity". Retrieved 4 September 2019.
50. Updating Ozone Calculations and Emissions Profiles for Use in the Atmospheric and Health Effects Framework Model http://www.epa.gov/ozone/science/effects/AHEF_2015_Update_Report-FINAL_508.pdf 17 April 2015 at the Wayback Machine
51. Rishav Goyal, Matthew H England, Alex Sen Gupta, and Martin Jucker. "Reduction in surface climate change achieved by the 1987 Montreal Protocol" Environmental Research Letters 2019 14 (12) 124041; doi:10.1088/1748-9326/ab4874
52. . eia.doe.gov. Archived from the original on 21 April 2011. Retrieved 16 September 2010.
53. Mario Molina, Durwood Zaelke, K. Madhava Sarma, Stephen O. Andersen, Veerabhadran Ramanathan, and Donald Kaniaru. "Reducing abrupt climate change risk using the Montreal Protocol and other regulatory actions to complement cuts in CO₂ emissions" PNAS 2009 106 (49) 20616-20621; doi:10.1073/pnas.0902568106
54. CS Norman, SJ DeCanio and L Fan. "The Montreal Protocol at 20: Ongoing opportunities for integration with climate protection." Global Environmental Change Volume 18, Issue 2, May 2008, Pages 330–340; doi:10.1016/j.gloenvcha.2008.03.003
55. UNEP press release, 2008 http://www.unep.org/Documents.Multilingual/Default.asp?DocumentID=593&ArticleID=6250&l=en&t=long 16 November 2010 at the Wayback Machine
56. "Banned Ozone-Depleting Chemical Is Still Being Produced Somewhere, Scientists Say". NPR. 17 May 2018. Retrieved 17 May 2018.
57. Stephen A. Montzka; et al. (17 May 2018). "An unexpected and persistent increase in global emissions of ozone-depleting CFC-11" (PDF). Nature. 557 (7705): 413–417. Bibcode:2018Natur.557..413M. doi:10.1038/s41586-018-0106-2. hdl:1983/fd5eaf00-34b1-4689-9f23-410a54182b61. PMID 29769666. S2CID 21705434.
58. M. F. Lunt; et al. (28 September 2018). "Continued Emissions of the Ozone‐Depleting Substance Carbon Tetrachloride From Eastern Asia". Geophysical Research Letters. 45 (20): 11, 423–11, 430. Bibcode:2018GeoRL..4511423L. doi:10.1029/2018GL079500. PMC 7526663. PMID 33005064.
59. . Ozone.unep.org. Archived from the original on 25 June 2012. Retrieved 11 July 2012.
60. Canan, Penelope and Nancy Reichman (2013, forthcoming), "The Montreal Protocol" in J. Britt Holbrook (Chief Editor) Ethics, Science, Technology, and Engineering: An International Resource, 2nd Edition, Thompson Learning.
61. ozone.unep.org

  This article incorporates public domain material from The World Factbook (2024 ed.). CIA. (Archived 2003 edition)(referred to as Ozone Layer Protection)

Further reading

• Andersen, S. O. and K. M. Sarma. (2002). Protecting the Ozone Layer: the United Nations History, Earthscan Press. London.^{[ISBN missing]}
• Andersen, S. O., K. M. Sarma and K. N. Taddonio. (2007). Technology Transfer for the Ozone Layer: Lessons for Climate Change. Earthscan Press, London.^{[ISBN missing]}
• Benedick, Richard E. (1991). Ozone Diplomacy. Harvard University Press. ISBN 0-674-65001-8 (Ambassador Benedick was the Chief U.S. Negotiator at the meetings that resulted in the Protocol.)
• Brodeur, Paul (1986). "Annals of Chemistry: In the Face of Doubt." The New Yorker, 9 June 1986, pp. 70–87.
• Chasek, Pam, David Downie, and J.W. Brown (2013). Global Environmental Politics, 6th ed., Boulder: Westview Press.^{[ISBN missing]}
• Dotto, Lydia and Harold Schiff (1978). The Ozone War. New York: Doubleday (publisher).^{[ISBN missing]}
• Downie, David (1993). "Comparative Public Policy of Ozone Layer Protection." Political Science (NZ) 45(2): (December): 186–197.
• Downie, David (1995). "Road Map or False Trail: Evaluating the Precedence of the Ozone Regime as Model and Strategy for Global Climate Change," International Environmental Affairs, 7(4):321–345 (Fall 1995).
• Downie, David (1999). "The Power to Destroy: Understanding Stratospheric Ozone Politics as a Common Pool Resource Problem", in J. Barkin and G. Shambaugh (eds.) Anarchy and the Environment: The International Relations of Common Pool Resources. Albany: State University of New York Press.^{[ISBN missing]}
• David L. Downie (2012). "The Vienna Convention, Montreal Protocol and Global Policy to Protect Stratospheric Ozone", in P. Wexler et al. (eds.) Chemicals, Environment, Health: A Global Management Perspective. Oxford: Taylor & Francis.^{[ISBN missing]}
• Downie, David (2013) "Stratospheric Ozone Depletion." The Routledge Handbook of Global Environmental Politics. New York: Routledge.^{[ISBN missing]}
• Farman, J.C., B.G. Gardiner, and J.D. Shanklin (1985). "Large Losses of Total Ozone in Antarctica Reveal Seasonal ClO
  _x/NO_x Interaction." Nature 315: 207–210, 16 May 1985.
• Gareau, Brian J. (2013). From Precaution to Profit: Contemporary Challenges to Environmental Protection in the Montreal Protocol. New Haven & London: Yale University Press. ISBN 978-0300175264
• Grundmann, Reiner. (2001). Transnational Environmental Policy: Reconstructing Ozone, London: Routledge. ISBN 0-415-22423-3
• Litfin, Karen T. (1994). Ozone Discourses. Columbia University Press. ISBN 0-231-08137-5
• Molina, Mario and F. Sherwood Rowland (1974). "Stratospheric Sink for Chlorofluoromethanes: Chlorine Atomic Catalyzed Destruction of Ozone." Nature 249: 810–812, 28 June 1974.
• Morissette, P.M. (1989). "The evolution of policy responses to stratospheric ozone depletion." Natural Resources Journal 29: 793–820.
• Parson, Edward (2003). Protecting the Ozone Layer: Science and Strategy. Oxford: Oxford University Press.^{[ISBN missing]}
• Roan, Sharon (1989). Ozone Crisis: The 15-Year Evolution of a Sudden Global Emergency. New York, John Wiley and Sons^{[ISBN missing]}
• United Nations Environmental Programme. (2012). .
• Velders, G. J. M., S. O. Andersen, J. S. Daniel, D. W. Fahey, and M. McFarland. (2007). The Importance of the Montreal Protocol in Protecting the Climate. Proc. of the Natl. Acad. Of Sci., 104(12), 4814–4819, doi:10.1073/pnas.0610328104.
• Velders, G. J. M., D. W. Fahey, J. S Daniel, M. McFarland, and S. O. Andersen. (2009). The Large Contribution of Projected HFC Emissions to Future Climate Forcing. Proc. of the Natl. Acad. Of Sci., 106(27), doi:10.1073/pnas.0902817106.
• Velders, G. J. M., A. R. Ravishankara, M. K. Miller, M. J. Molina, J. Alcamo, J. S. Daniel, D. W. Fahey, S. A. Montzka, and S. Reimann. (2012). Preserving Montreal Protocol Climate Benefits by Limiting HFCs. Science, 335(6071), 922–923, doi:10.1126/science.1216414.

External links

• Multilateral Fund for the Implementation of the Montreal Protocol
• U.S. EPA Ozone Layer Protection Information Home Page
• The Montreal Protocol Who's Who 31 May 2010 at the Wayback Machine
• by F.Sherwood Rowland and Mario J.Molina
• Has the Montreal Protocol been successful in reducing ozone-depleting gases in the atmosphere? (NOAA Aeronomy Lab)
• Doomsday Déjà vu: Ozone Depletion's Lessons for Global Warming 10 September 2009 at the Wayback Machine by
• EIA reports: Reports on illegal trade and solutions.
• Introductory note by Edith Brown Weiss, procedural history note and audiovisual material on the Montreal Protocol on Substances that Deplete the Ozone Layer in the Historic Archives of the United Nations Audiovisual Library of International Law
• Green Cooling Initiative
• Green Cooling Initiative on alternative natural refrigerants cooling technologies