United Nations Project Mechanisms

Last update 21.02.2024

The use of project mechanisms - the crediting of reduction results between countries and the international crediting of climate protection projects - is an important climate protection instrument. You can find a detailed overview on this page.

Source: © Riccardo Niels Mayer – stock.adobe.com

Project Mechanisms at a Glance

Climate action requires a global commitment and a global approach. The signatory states of the Paris Agreement and its predecessor, the Kyoto Protocol, set themselves the goal of curbing climate change. Important instruments for achieving this goal are the use of project mechanisms, crediting reduction results between countries and the international crediting of climate protection projects. These are regulated in Article 6 of the Paris Agreement. The mechanisms help to ensure that emission reductions are realised in areas where reduction costs are minimised. This can increase overall ambition and contribute to sustainable development at the same time. The basic idea is that where emissions are reduced is of secondary importance for climate protection.

Objectives of the Paris Agreement and the Role of the Project Mechanisms

Compared to the Kyoto Protocol, whose main objective was to reduce greenhouse gases, the Paris Agreement specified the objective in a more comprehensive way.

In addition to reducing emissions, the Paris Agreement’s key objectives are:

  • limiting the increase in the global average temperature (to below 2°C, preferably 1.5°C, compared to pre-industrial levels),
  • strengthening the capacity of countries’ ability to deal with the impacts of climate change (adaptation to climate change) and
  • redirecting financial flows towards an economy with low greenhouse gas emissions and sustainable development (channelling financial resources).

The way and approaches the countries adopt to achieve their climate protection targets is not specified. Nevertheless, the Paris Agreement, like the Kyoto Protocol, offers the possibility of utilising (project-based) market mechanisms, although it uses a general wording. Specific rules and modalities as well as technical details for the implementation of these mechanisms are being developed. Both climate protection agreements are regarded as the basis for the creation of an international market for emission credits.

The mechanisms in Article 6 are an important instrument of the Paris Agreement: they enable the transfer and crediting of mitigation results between countries and the international crediting of climate protection projects. This is intended to enable cost-efficient fulfilment of climate protection targets and increase overall ambition. Furthermore, the mechanisms are supposed to support sustainable development with additional reductions in global emissions (raising ambition, achieving further ecological and social goals) and incentivise the use of environmentally friendly technologies (transformation).

These approaches are expected to cover the demand of the signatory countries for options for international cooperation in the carbon market.

Project mechanismDescriptionAgreement and articlePeriod
Co-operation mechanisms

Three approaches for an international carbon market are explicitly specified: 

  1. Collaborations aimed at the use of internationally transferred reduction results to achieve the nationally determined contributions (Article 6.2)
  2. An internationally monitored mechanism for reducing a country’s emissions by transferring the reduction results and supporting sustainable developments with additional reduction of global emissions (Article 6.4)
  3. Non-market-based approaches to promote mitigation and adaptation (Article 6.8).
Paris Agreement, Article 6Starting in 2021
Clean Development Mechanism (CDM)Countries or companies were able to use these projects in developing and emerging countries (without their own reduction commitment) to acquire emission credits (CERs) that could be offset against their own commitments.Kyoto Protocol, Article 12From 2008 to 2020
Joint Implementation (JI)In JI projects, two industrialised countries worked together in partnership to achieve their specified goal of reducing emissions. One of countries financed a climate protection project in the other country. In return, reduction certificates (Emission Reduction Units (ERUs)) were offset towards the reduction target. The host country, in turn, had to reduce its own emission allowances by the number of certificates exported.Kyoto Protocol, Article 6From 2008 to 2020

Paris Agreement Project Mechanisms

The Paris Agreement adopted in 2015 has applied to global climate protection since 2021. Within this agreement Article 6 also envisages the international use of market-based mechanisms. Consequently, the Paris Agreement project mechanisms have once again become an important instrument of cooperation.

Paris Agreement
Source: MEDDE - Arnaud Bouissou

The market mechanisms named in Article 6 of the Paris Agreement explicitly specify three approaches for an international carbon market:

  • Collaborations aimed at the use of internationally transferred reduction results to achieve the nationally determined contributions (Article 6.2)
  • An internationally monitored mechanism for reducing a country’s emissions by transferring the reduction results and supporting sustainable developments with additional reduction of global emissions (Article 6.4)
  • Non-market-based approaches to promote mitigation and adaptation (Article 6.8).

These three approaches are expected to cover the needs of all countries for international cooperation opportunities within the carbon market. The mechanisms are available to all countries for voluntary use in order to achieve the Paris Agreement’s interdisciplinary goals. This means that reduction results from climate protection projects can be transferred between countries and used to offset mutually agreed targets.

In addition to reducing emissions or enhancing carbon dioxide removal (for example by rewetting peatlands or reforestation), this instrument is also intended to contribute to sustainable development and the financing of adaptation measures. Not only should countries become active but also private stakeholders such as airlines can be considered as buyers of these reduction credits.

A robust accounting system that reliably prevents double counting and other risks to environmental integrity is essential.

Our Research Results for Article 6

The research project "Strengthening the transformative impact of market approaches under the Paris Agreement" (research index 3719 42 504 0) analysed and developed prerequisites for Article 6 of the Paris Agreement and while doing so it focussed on stronger transformative approaches. Where possible, these should be designed and applied in such a way that transformation paths are ambitiously pursued and maintained.

The research team defined the term ‘transformation’ or ‘transformative change’ in the project as follows: "A fundamental, sustainable change in a system that ends established carbon-intensive practices and contributes to an emission-free society in line with the Paris Agreement's goal of limiting global warming to 1.5-2°C and the United Nations’ Sustainable Development Goals".
Four features are particularly relevant to the objectives of Article 6: ‘digitalisation’, ‘private sector and governments’, ‘carbon pricing’ and ‘dynamic baselines’.

A further research project "Adapting CDM methodologies for use under Article 6 of the Paris Agreement" includes a „Lessons Learned“ report and a final report. The Lessons Learned report summarizes key findings from the project-based mechnismens oft the Kyoto Protocol. While the final report includes further analysis of the extent to which existing methodologies for determining additionality and baseline as well as monitoring can be adjusted to transition to the Article 6.4 mechanism.

A comprehensive fact sheet is resulted from another research project "Analysis of the role of Article 6 in Parties’ NDCs". It examines the role of Article 6 of the Paris Agreement in the Nationally Determined Contributions (NDCs) that Parties have submitted to the United Nations Framework Convention on Climate Change ⁠(UNFCCC). The findings indicate that there is in general considerable openness towards Article 6, with the intention to buy units being much more limited than to sell such units.

Research Results

Climate Change 40/2022: Promoting transformational change through carbon markets

Climate Change 02/2024: Lessons Learned from the Kyoto Mechanisms for the Article 6.4 Mechanism

Climate Change 01/2024: Adapting CDM methodologies for use under Article 6 of the Paris Agreement

Climate Change 03/2024: Analysis of the role of Article 6 in Parties’ NDCs

Kyoto Protocol Project Mechanisms

The Kyoto Protocol was adopted in 1997 during the third Conference of the Parties (CMP 3) of the United Nations Framework Convention on Climate Change (UNFCCC). It came into force in 2005 and is the world's first legally binding international treaty on climate change mitigation. It obligates the participating countries to reduce emissions of climate-damaging gases.

It is made up of two commitment periods: the first one from 2008 to 2012 and the second one from 2013 to 2020, during which the industrialised countries listed in Annex B of the Protocol undertook to reduce their greenhouse gas emissions.

The Kyoto Protocol offered two project-based mechanisms: Clean Development Mechanism (CDM) and Joint Implementation (JI). CDM and JI, as elements of the Kyoto Protocol, are bound in terms of their applicability to the Kyoto Protocol commitment periods.

Clean Development Mechanism (CDM)

Climate protection projects under the Clean Development Mechanism (CDM) were part of the flexible Kyoto mechanisms operating in accordance with Article 12 of the Kyoto Protocol. Industrialised countries were able to meet their reduction or stabilisation commitments by financially supporting or implementing CDM climate protection projects in less developed countries.

Joint Implementation (JI)

Similar to the Clean Development Mechanism (CDM), Joint Implementation (JI) climate protection projects were among the project-based flexible Kyoto mechanisms. They operated under Article 6 of the Kyoto Protocol and offered industrialised countries an option to reduce greenhouse gases in the host industrialised country in accordance with their commitment under the Kyoto Protocol. Companies were also able to participate in JI projects and use the certificates they received as a result. In principle, only the countries listed in Annex B of the Kyoto Protocol or companies in these countries were allowed to participate in JI climate protection projects.

Since the generation of Emission Reduction Units (ERUs) requires the allocation of Assigned Amount Units (AAUs) to the contracting states for the second Kyoto commitment period, the approvals for JI projects were limited until the end of the first commitment period.

No approvals for JI projects were granted by Germany in the period between 2013 and 2020. This was due to the fact that the entry into force of the second commitment period was delayed until 31/12/2020, which coincided with its expiration date.

End of the Kyoto Protocol Project Mechanisms

The second commitment period (2013 to 2020) of the Kyoto Protocol, which was adopted at the eighth Conference of the Parties (CMP 8) of the Kyoto Protocol in Doha in 2012, ended on 31/12/2020. As a result, the CDM and JI project mechanisms also expired and will be replaced in future by the cooperation mechanisms under Article 6 of the Paris Agreement.

The existing regulations are therefore applicable solely to projects registered by the end of 2020 and emission reductions achieved by then. Consequently, the German ‘Designated National Authority (DNA)’ at the German Environment Agency, as the competent body, terminated implementation in accordance with ProMechG at the end of the true-up period of the second commitment period.

Further Information

Ratification of Multilateral Climate Agreement Gives Boost to Delivering Agreed Climate Pledges and to Tackling Climate Change

The CDM Executive Board Agrees on Temporary Measures to Address COP26 Postponement

Project Mechanisms at the World Climate Conferences

The World climate conferences are annual gatherings known as the Conference of the Parties (COP) to the UN Framework Convention on Climate Change. They are also often referred to as UN Climate Conferences or World Climate Summits. Since 2005, the conference has been supplemented by the meeting of the Kyoto Protocol members (Conference of the Parties serving as the meeting of the Parties to the Protocol, COP/MOP, CMP for short), and since 2018 by including members of the Paris Agreement (Conference of the Parties serving as the meeting of the Parties to the Paris Agreement, CMA for short).

Overview UN climate change conferences
Source: own representation / © pyty - stock.adobe.com

We are presenting here the subsequent climate conferences in connection with the project mechanisms following the important Paris Agreement COP 21 in 2015.

COP 26 was originally planned to be in Glasgow, Scotland for November 2020 but postponed because of the COVID 19 pandemic to November 2021.

Publications