United Nations Framework Convention on Climate Change

Key agreements and protocols

Kyoto Protocol

The Kyoto Protocol (Japanese: 京都議定書, Hepburn: Kyōto Giteisho) was an international treaty which extended the 1992 United Nations Framework Convention on Climate Change (UNFCCC) that commits state parties to reduce greenhouse gas emissions, based on the scientific consensus that global warming is occurring and that human-made CO₂ emissions are driving it. The Kyoto Protocol was adopted in Kyoto, Japan, on 11 December 1997 and entered into force on 16 February 2005. There were 192 parties (Canada withdrew from the protocol, effective December 2012) to the Protocol in 2020.

The Kyoto Protocol implemented the objective of the UNFCCC to reduce the onset of global warming by reducing greenhouse gas concentrations in the atmosphere to "a level that would prevent dangerous anthropogenic interference with the climate system" (Article 2). The Kyoto Protocol applied to the seven greenhouse gases listed in Annex A: carbon dioxide (CO₂), methane (CH₄), nitrous oxide (N₂O), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), sulfur hexafluoride (SF₆), nitrogen trifluoride (NF₃). Nitrogen trifluoride was added for the second compliance period during the Doha Round.

The Protocol was based on the principle of common but differentiated responsibilities: it acknowledged that individual countries have different capabilities in combating climate change, owing to economic development, and therefore placed the obligation to reduce current emissions on developed countries on the basis that they are historically responsible for the current levels of greenhouse gases in the atmosphere.

The Protocol's first commitment period started in 2008 and ended in 2012. All 36 countries that fully participated in the first commitment period complied with the Protocol. However, nine countries had to resort to the flexibility mechanisms by funding emission reductions in other countries because their national emissions were slightly greater than their targets. The 2008 financial crisis reduced emissions. The greatest emission reductions were seen in the former Eastern Bloc countries because the dissolution of the Soviet Union reduced their emissions in the early 1990s. Even though the 36 developed countries reduced their emissions, the global emissions increased by 32% from 1990 to 2010.

Paris Agreement

The Paris Agreement (also called the Paris Accords or Paris Climate Accords) is an international treaty on climate change that was signed in 2016. The treaty covers climate change mitigation, adaptation, and finance. The Paris Agreement was negotiated by 196 parties at the 2015 United Nations Climate Change Conference near Paris, France. As of January 2026, 194 members of the United Nations Framework Convention on Climate Change (UNFCCC) are parties to the agreement. Of the three UNFCCC member states which have not ratified the agreement, the only major emitter is Iran. The United States, the second largest emitter, withdrew from the agreement in 2020, rejoined in 2021, and withdrew again in 2026.

The Paris Agreement has a long-term temperature goal which is to keep the rise in global surface temperature to well below 2 °C (3.6 °F) above pre-industrial levels. The treaty also states that preferably the limit of the increase should only be 1.5 °C (2.7 °F). These limits are defined as averages of the global temperature measured over twenty years.

Further commitments

In addition to the Kyoto Protocol (and its amendment) and the Paris Agreement, parties to the Convention have agreed to further commitments during UNFCCC Conferences of the Parties. These include the Bali Action Plan (2007), the Copenhagen Accord (2009), the Cancún agreements (2010), and the Durban Platform for Enhanced Action (2012).

Bali Action Plan

As part of the Bali Action Plan, adopted in 2007, all developed country Parties have agreed to "quantified emission limitation and reduction objectives, while ensuring the comparability of efforts among them, taking into account differences in their national circumstances". Developing country Parties agreed to "[nationally] appropriate mitigation actions context of sustainable development, supported and enabled by technology, financing and capacity-building, in a measurable, reportable and verifiable manner." 42 developed countries have submitted mitigation targets to the UNFCCC secretariat, as have 57 developing countries and the African Group (a group of countries within the UN).

Copenhagen Accord and Cancún agreements

As part of the 2009 Copenhagen negotiations, a number of countries produced the Copenhagen Accord. The Accord states that global warming should be limited to below 2.0 °C (3.6 °F). The Accord does not specify what the baseline is for these temperature targets (e.g., relative to pre-industrial or 1990 temperatures). According to the UNFCCC, these targets are relative to pre-industrial temperatures.

114 countries agreed to the Accord. The UNFCCC secretariat notes that "Some Parties ... stated in their communications to the secretariat specific understandings on the nature of the Accord and related matters, based on which they have agreed to [the Accord]." The Accord was not formally adopted by the Conference of the Parties. Instead, the COP "took note of the Copenhagen Accord."

As part of the Accord, 17 developed country Parties and the EU-27 submitted mitigation targets, as did 45 developing country Parties. Some developing country Parties noted the need for international support in their plans.

As part of the Cancún agreements, developed and developing countries submitted mitigation plans to the UNFCCC. These plans were compiled with those made as part of the Bali Action Plan.

UN Race-to-Zero Emissions Breakthroughs

At the 2021 annual meeting UNFCCC launched the 'UN Race-to-Zero Emissions Breakthroughs'. The aim of the campaign is to transform 20 sectors of the economy in order to achieve zero greenhouse gas emissions. At least 20% of each sector should take specific measures, and 10 sectors should be transformed before COP 26 in Glasgow. According to the organizers, 20% is a tipping point, after which the whole sector begins to irreversibly change.

Developing countries

At Berlin, Cancún, and Durban, the development needs of developing country parties were reiterated. For example, the Durban Platform reaffirms that:

[...] social and economic development and poverty eradication are the first and overriding priorities of developing country Parties, and that a low-emission development strategy is central to sustainable development, and that the share of global emissions originating in developing countries will grow to meet their social and development needs.

Green Climate Fund

The UN Sustainable Development Goal 13 (SDG 13) includes a target about the UNFCCC and explains how the Green Climate Fund is meant to be used: One of the five targets under SDG 13, meant to be achieved by 2030, states: "Implement the commitment undertaken by developed-country parties to the United Nations Framework Convention on Climate Change to a goal of mobilizing jointly $100 billion annually by 2020 from all sources to address the needs of developing countries in the context of meaningful mitigation actions and transparency on implementation and fully operationalize the Green Climate Fund through its capitalization as soon as possible." This target only has one indicator: Indicator 13.a is the "Amounts provided and mobilized in United States dollars per year in relation to the continued existing collective mobilization goal of the $100 billion commitment through to 2025".

The Green Climate Fund (GCF) is a fund for climate finance that was established within the framework of the United Nations Framework Convention on Climate Change (UNFCCC). Considered the world's largest fund of its kind, GCF's objective is to assist developing countries with climate change adaptation and mitigation activities. The GCF is an operating entity of the financial mechanism of the UNFCCC. It is based in Songdo, Incheon, South Korea. It is governed by a Board of 24 members and supported by a Secretariat.

Mafalda Duarte, a Portuguese development economist, is the Fund's Executive Director.

The Green Climate Fund supports projects and other activities in developing countries using thematic funding windows. It is intended that the Green Climate Fund be the centrepiece of efforts to raise climate finance under the UNFCCC. There are four other, smaller multilateral climate funds for paying out money in climate finance which are coordinated by the UNFCCC. These include the Adaptation Fund (AF), the Least Developed Countries Fund (LDCF), the Special Climate Change Fund (SCCF) and the Global Environment Facility (GEF). The GCF is the largest of these five funds.

As of Dec 2023, the GCF had a portfolio of 13.5 billion USD (51.9 billion USD including co-financing).

The process of designing the GCF has raised several issues. These include ongoing questions on how funds will be raised, the role of the private sector, the level of "country ownership" of resources, and the transparency of the Board itself. Also, this additional international climate institution might further fragment taxpayer's money that is put towards climate action.

The Fund's former director Héla Cheikhrouhou has complained in 2016 that the Fund is backing too many "business-as-usual types of investment proposals". This view is echoed by a number of civil society organizations.

In 2023, the Executive Director announced a series of reforms aimed at making the Fund more efficient and positioned to deliver greater impact.

Secretariat and offices

"UNFCCC" is also the name of the Secretariat charged with supporting the operation of the convention, with offices on the UN Campus in Bonn, Germany. Offices were formerly located in Haus Carstanjen and in a building on the UN Campus known as Langer Eugen.

The secretariat is established under Article 8 of the convention and headed by the Executive Secretary. The secretariat, augmented through the parallel efforts of the Intergovernmental Panel on Climate Change (IPCC), aims to gain consensus through meetings and the discussion of various strategies. Since the signing of the UNFCCC treaty, Conferences of the Parties (COPs) have discussed how to achieve the treaty's aims.

From 2010 to 2016 the head of the secretariat was Christiana Figueres, following by Patricia Espinosa who was appointed Executive Secretary on 18 May 2016 by United Nations Secretary-General Ban Ki-moon and took office on 18 July 2016. Espinosa retired on 16 July 2022. UN Under Secretary General Ibrahim Thiaw served as the acting Executive Secretary in the interim. On 15 August 2022, Secretary-General António Guterres appointed former Grenadian climate minister Simon Stiell as Executive Secretary, replacing Espinosa.

Current and former executive secretaries are:

Processes

Relationship with IPCC reports

The reports published by IPCC play a key role in the annual climate negotiations held by the UNFCCC. For example, the UNFCCC invited the IPCC to prepare a report on global warming of 1.5 °C. The IPCC subsequently released the Special Report on Global Warming of 1.5 °C (SR15) in 2018. The report showed that it was possible to keep warming below 1.5 °C during the 21st century. But this would mean deep cuts in emissions. It would also mean rapid, far-reaching changes in all aspects of society. The report showed warming of 2 °C would have much more severe impacts than 1.5 °C. In other words: every bit of warming matters. SR15 had an unprecedented impact for an IPCC report in the media and with the public. It put the 1.5 °C target at the center of climate activism.

Conferences of the Parties (CoP)

The United Nations Climate Change Conference are yearly conferences held in the framework of the UNFCCC. They serve as the formal meeting of the UNFCCC Parties (Conferences of the Parties) (COP) to assess progress in dealing with climate change, and beginning in the mid-1990s, to negotiate the Kyoto Protocol to establish legally binding obligations for developed countries to reduce their greenhouse gas emissions. Since 2005 the Conferences also served as the Meetings of Parties of the Kyoto Protocol (CMP) and since 2016 the Conferences also serve as Meeting of the Parties to the Paris Agreement (CMA).

The first conference (COP1) was held in 1995 in Berlin. The 3rd conference (COP3) was held in Kyoto and resulted in the Kyoto protocol, which was amended during the 2012 Doha Conference (COP18, CMP 8). The COP21 (CMP11) conference was held in Paris in 2015 and resulted in adoption of the Paris Agreement. COP28 took place in the United Arab Emirates in 2023 and included the first global stocktake under the Paris Agreement. The UAE nominated Sultan al-Jaber, who is also head of Abu Dhabi's national oil company ADNOC, to preside over COP28. Azerbaijan hosted COP29 in 2024. COP30 was hosted in Brazil.

Subsidiary bodies

A subsidiary body is a committee that assists the Conference of the Parties. Subsidiary bodies include:

• Permanents:
  • The Subsidiary Body of Scientific and Technological Advice (SBSTA) is established by Article 9 of the convention to provide the Conference of the Parties and, as appropriate, its other subsidiary bodies with timely information and advice on scientific and technological matters relating to the convention. It serves as a link between information and assessments provided by expert sources (such as the IPCC) and the COP, which focuses on setting policy.
  • The Subsidiary Body of Implementation (SBI) is established by Article 10 of the convention to assist the Conference of the Parties in the assessment and review of the effective implementation of the convention. It makes recommendations on policy and implementation issues to the COP and, if requested, to other bodies.
• Temporary:
  • Ad hoc Group on Article 13 (AG13), active from 1995 to 1998;
  • Ad hoc Group on the Berlin Mandate (AGBM), active from 1995 to 1997;
  • Ad Hoc Working Group on Further Commitments for Annex I Parties under the Kyoto Protocol (AWG-KP), established in 2005 by the Parties to the Kyoto Protocol to consider further commitments of industrialized countries under the Kyoto Protocol for the period beyond 2012; it concluded its work in 2012 when the CMP adopted the Doha Amendment;
  • Ad Hoc Working Group on Long-term Cooperative Action (AWG-LCA), established in Bali in 2007 to conduct negotiations on a strengthened international deal on climate change;
  • Ad Hoc Working Group on the Durban Platform for Enhanced Action (ADP), established at COP 17 in Durban in 2011 "to develop a protocol, another legal instrument or an agreed outcome with legal force under the Convention applicable to all Parties." The ADP concluded its work in Paris on 5 December 2015.

National communication

A "National Communication" is a type of report submitted by the countries that have ratified the United Nations Framework Convention on Climate Change (UNFCCC). Developed countries are required to submit National Communications every four years and developing countries should do so. Some Least Developed Countries have not submitted National Communications in the past 5–15 years, largely due to capacity constraints.

National Communication reports are often several hundred pages long and cover a country's measures to mitigate greenhouse gas emissions as well as a description of its vulnerabilities and impacts from climate change. National Communications are prepared according to guidelines that have been agreed by the Conference of the Parties to the UNFCCC. The (Intended) Nationally Determined Contributions (NDCs) that form the basis of the Paris Agreement are shorter and less detailed but also follow a standardized structure and are subject to technical review by experts.

Nationally Determined Contributions

At the 19th session of the Conference of the Parties in Warsaw in 2013, the UNFCCC created a mechanism for Intended Nationally Determined Contributions (INDCs) to be submitted in the run up to the 21st session of the Conference of the Parties in Paris (COP21) in 2015. Countries were given freedom and flexibility to ensure that these climate change mitigation and adaptation plans were nationally appropriate. This flexibility, especially regarding the types of actions to be undertaken, allowed for developing countries to tailor their plans to their specific adaptation and mitigation needs, as well as towards other needs.

In the aftermath of COP21, these INDCs became Nationally Determined Contributions (NDCs) as each country ratified the Paris Agreement, unless a new NDC was submitted to the UNFCCC at the same time. The 22nd session of the Conference of the Parties (COP22) in Marrakesh focused on these Nationally Determined Contributions and their implementation, after the Paris Agreement entered into force on 4 November 2016.

Membership and participation

As of 2022, the UNFCCC has 198 parties including all United Nations member states, United Nations General Assembly observers the State of Palestine and the Holy See, UN non-member states Niue and the Cook Islands, and the supranational union European Union.

The United States announced its intention to withdraw from the treaty in January 2026, the only country to do so.

Classification of Parties and their commitments

Parties to the UNFCCC are classified as:

• Annex I: There are 43 Parties to the UNFCCC listed in Annex I of the convention, including the European Union. These Parties are classified as industrialized (developed) countries and "economies in transition" (EITs). The 14 EITs are the former centrally-planned (Soviet) economies of Russia and Eastern Europe.
• Annex II: Of the Parties listed in Annex I of the convention, 24 are also listed in Annex II of the convention, including the European Union. These Parties are made up of members of the Organisation for Economic Co-operation and Development (OECD): these Parties consist of the members of the OECD in 1992, minus Turkey, plus the EU. Annex II Parties are required to provide financial and technical support to the EITs and developing countries to assist them in reducing their greenhouse gas emissions (climate change mitigation) and manage the impacts of climate change (climate change adaptation).
• Least-developed countries (LDCs): 49 Parties are LDCs, and are given special status under the treaty in view of their limited capacity to adapt to the effects of climate change.
• Non-Annex I: Parties to the UNFCCC not listed in Annex I of the convention are mostly low-income developing countries. Developing countries may volunteer to become Annex I countries when they are sufficiently developed.

List of parties

Annex I countries

There are 43 Annex I Parties including the European Union. These countries are classified as industrialized countries and economies in transition. Of these, 24 are also Annex II Parties, including the European Union, and 14 are Economies in Transition.

Annex I countries (24 of these are also Annex II Parties):

1. Australia
2. Austria
3. Belgium
4. Canada
5. Cyprus
6. Denmark
7. EU
8. Finland
9. France
10. Germany
11. Greece
12. Iceland
13. Ireland
14. Italy
15. Japan
16. Liechtenstein
17. Luxembourg
18. Malta
19. Monaco
20. Netherlands
21. New Zealand
22. Norway
23. Portugal
24. Spain
25. Sweden
26. Switzerland
27. Turkey
28. United Kingdom
29. United States of America

Annex I countries that are Economies in Transition:

1. Belarus
2. Bulgaria
3. Croatia
4. Czech Republic
5. Estonia
6. Hungary
7. Latvia
8. Lithuania
9. Poland
10. Romania
11. Russian Federation
12. Slovakia
13. Slovenia
14. Ukraine

Notes

Engagement of civil society

In 2014, The UN with Peru and France created the Global Climate Action Portal NAZCA for writing and checking all the climate commitments.

Thousands of observers from civil society, business and academia attend the COPs. They organize a huge programme of activities including officially coordinated "side events". These complement and inform the official negotiations.

Civil Society Observers under the UNFCCC have organized themselves in loose groups, covering about 90% of all admitted organisations. Some groups remain outside these broad groupings, such as faith groups or national parliamentarians. The UNFCCC secretariat also recognizes the following groups as informal NGO groups (2016): Faith-based organizations, Education and Capacity Building and Outreach NGOs, parliamentarians.

An overview is given in the table below:

Analysis

Interpreting ultimate objective in Article 2

The ultimate objective of the Framework Convention contains some key words that are discussed further below and shown here in italics: "stabilization of greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous anthropogenic [i.e., human-caused] interference with the climate system".

To stabilize atmospheric GHG concentrations, global anthropogenic GHG emissions would need to peak then decline (see climate change mitigation). Lower stabilization levels would require emissions to peak and decline earlier compared to higher stabilization levels. These lower stabilization levels are associated with lower magnitudes of global warming compared to higher stabilization levels.

There are a range of views over what level of climate change is dangerous. Scientific analysis can provide information on the risks of climate change, but deciding which risks are dangerous requires value judgements.

The global warming that has already occurred poses a risk to some human and natural systems. Higher magnitudes of global warming will generally increase the risk of negative impacts. Climate change risks are "considerable" with 1 to 2 °C of global warming, relative to pre-industrial levels. 4 °C warming would lead to significantly increased risks, with potential impacts including widespread loss of biodiversity and reduced global and regional food security.

Climate change policies may lead to costs that are relevant to the article 2. For example, more stringent policies to control GHG emissions may reduce the risk of more severe climate change, but may also be more expensive to implement.

In decision making, the precautionary principle is considered when possibly dangerous, irreversible, or catastrophic events are identified, but scientific evaluation of the potential damage is not sufficiently certain. The precautionary principle implies an emphasis on the need to prevent such adverse effects. Following the precautionary principle, uncertainty (about the exact effects of climate change) is not a reason for inaction, and this is acknowledged in Article 3.3 of the UNFCCC.

International trade

Academics and environmentalists criticize article 3(5) of the convention, which states that any climate measures that would restrict international trade should be avoided.

Reception

Criticism of processes

The overall umbrella and processes of the UNFCCC and the adopted Kyoto Protocol have been criticized by some as not having achieved their stated goals of reducing the emission of greenhouse gases. The UNFCCC is a multilateral body concerned with climate change and can be an inefficient system for enacting international policy: Because the framework system includes over 190 countries and because negotiations are governed by consensus, small groups of countries can often block progress.

There has been a failure to achieve effective greenhouse gas emission reduction policy treaties since 1992. This has driven some countries like the United States to hold back from ratifying the UNFCCC's most important agreement—the Kyoto Protocol—in large part because the treaty did not cover developing countries which now include the largest CO₂ emitters. However, this failed to take into account both the historical responsibility for climate change since industrialization, which is a contentious issue in the talks, and also responsibility for emissions from consumption and importation of goods (see carbon footprint). It has also led Canada to withdraw from the Kyoto Protocol in 2011 out of a wish not to make its citizens pay penalties that would result in wealth transfers out of Canada. Both the US and Canada are looking at internal Voluntary Emissions Reduction schemes to curb carbon dioxide emissions outside the Kyoto Protocol.

The perceived lack of progress has also led some countries to seek and focus on alternative high-value activities like the creation of the Climate and Clean Air Coalition to Reduce Short-Lived Climate Pollutants which seeks to regulate short-lived pollutants such as methane, black carbon and hydrofluorocarbons (HFCs), which together are believed to account for up to one third of current global warming but whose regulation is not as fraught with wide economic impacts and opposition.

In 2010, Japan stated that it will not sign up to a second Kyoto term, because it would impose restrictions on it not faced by its main economic competitors, China, India and Indonesia. A similar indication was given by the Prime Minister of New Zealand in November 2012. At the 2012 conference, last-minute objections at the conference by Russia, Ukraine, Belarus and Kazakhstan were ignored by the governing officials, and they have indicated that they will likely withdraw or not ratify the treaty. These defections place additional pressures on the UNFCCC process that is seen by some as cumbersome and expensive: in the UK alone, the climate change department has taken over 3,000 flights in two years at a cost of over £1,300,000 (British pounds sterling).

Further, the UNFCCC (mainly during the Kyoto protocol) failed to facilitate the transfer of environmentally sound technologies (SETs) which are mechanisms used to decrease the vulnerability of the human race against the unfavorable effects of climate change. One of the more widely used of these being renewable energy sources. The UNFCCC created the body "technology mechanism" who would distribute these resources to developing countries; however this distribution was too moderate and, coupled with the failings of the first commitment period of the Kyoto protocol, led to low ratification numbers for the second commitment (resulting in it not going ahead). Before the 2015 United Nations Climate Change Conference, National Geographic magazine added to the criticism, writing: "Since 1992, when the world's nations agreed at Rio de Janeiro to avoid 'dangerous anthropogenic interference with the climate system,' they've met 20 times without moving the needle on carbon emissions. In that interval we've added almost as much carbon to the atmosphere as we did in the previous century."

Criticism of effectiveness of Paris Agreement

The effectiveness of the Paris Agreement to reach its climate goals is under debate, with most experts saying it is insufficient for its more ambitious goal of keeping global temperature rise under 1.5 °C. Many of the exact provisions of the Paris Agreement have yet to be straightened out, so that it may be too early to judge effectiveness. According to the 2020 United Nations Environment Programme (UNEP), with the current climate commitments of the Paris Agreement, global mean temperatures will likely rise by more than 3 °C by the end of the 21st century. Newer net zero commitments were not included in the Nationally Determined Contributions, and may bring down temperatures by a further 0.5 °C.

With initial pledges by countries inadequate, faster and more expensive future mitigation would be needed to still reach the targets. Furthermore, there is a gap between pledges by countries in their NDCs and implementation of these pledges; one third of the emission gap between the lowest-costs and actual reductions in emissions would be closed by implementing existing pledges. A pair of studies in Nature found that as of 2017 none of the major industrialized nations were implementing the policies they had pledged, and none met their pledged emission reduction targets, and even if they had, the sum of all member pledges (as of 2016) would not keep global temperature rise "well below 2°C".

In 2021, a study using a probabilistic model concluded that the rates of emissions reductions would have to increase by 80% beyond NDCs to likely meet the 2 °C upper target of the Paris Agreement, that the probabilities of major emitters meeting their NDCs without such an increase is very low. It estimated that with current trends the probability of staying below 2 °C of warming is 5–26% if NDCs were met and continued post-2030 by all signatories.

As of 2020, there is little scientific literature on the topics of the effectiveness of the Paris Agreement on capacity building and adaptation, even though they feature prominently in the Paris Agreement. The literature available is mostly mixed in its conclusions about loss and damage, and adaptation.

According to the stocktake report, the agreement has a significant effect: while in 2010 the expected temperature rise by 2100 was 3.7–4.8 °C, at COP 27 it was 2.4–2.6 °C and if all countries will fulfill their long-term pledges even 1.7–2.1 °C. Despite it, the world is still very far from reaching the aim of the agreement: limiting temperature rise to 1.5 degrees. For doing this, emissions must peak by 2025. Recent work – on the basis of the first single calendar year in 2024 with an average temperature above 1.5 degrees Celsius – indicates that most probably Earth has already entered the 20-year period that will reach an average warming of 1.5 degrees Celsius. Furthermore, it has been suggested that the global mean temperature may have already passed the 1.5 degrees Celsius level in 2024.

The Paris Agreement also seemed to have influenced the focus of the following IPCC reports. Before the Paris Agreement was settled, the IPCC assessment reports focused roughly in equal proportions on temperatures above and below 2 °C. However, in the 6th assessment report, after the Paris Engagement was reached, slightly less than 20% of the temperature mentions are above 2 °C and almost 50% focus on 1.5 °C alone.

Awards

In 2016, the UNFCCC received the "Prince or Princess of Asturias Award for International Cooperation" by the Princess of Asturias Awards.

Meetings of the Parties

A Conference of the Parties (COP) has been held annually for most years since 1995.