This section first analyzed rationalities of the chosen type of mechanism and coverage of the system according to the purposes and principles of CAs and SDM. Different fundamental contents of CAs and SDM have been compared. A couple of precautions while designing an operational framework were then explained to make the results more reasonable. After that, the chosen governance scenarios of CAs and SDM were illustrated through a comparative analysis of the four management scenarios classified by the World Bank, respectively. The coordination among different associations was also emphasized. Furthermore, the reasons to merge the operational framework and governance framework into the implementation framework were discussed. The procedures of the implementation framework of CAs and SDM were analyzed as well.
Fundamental contents analysis
Type of mechanism
Regarding the trading unit's authorization level, the global carbon trading mechanism is mainly formed and developed by the UNFCCC. Trading units are usually set according to the regional/ sub-regional and national standards, such as the EU carbon emissions trading system[i]. The trading units issued are authorized by the UNFCCC, such as JI and CDM.
The purpose of CAs is to help countries achieve INDCs through international cooperation. Due to the Paris Agreement's extensive participation, CAs break through the limitation of original mandatory emission reductions under the UNFCCC framework while adhering to the "common but differentiated" principle. CAs can make full use of regional/ sub-regional and bilateral/ multilateral agreements among countries to provide Parties with the most room for an independent decision. SDM adopts international harmonization coordination to select baselines, technology transfer, financial support, and verification of emission reduction results to help developing countries, tiny island countries, and very underdeveloped countries[ii]. As a result, CAs shall work under international- regional/ sub-regional level, and SDM shall work under international level authorization.
The quota-based carbon trading mechanism is used to mitigate planned carbon emissions to the type of subject matter. A credit-based carbon trading mechanism is used for long-term carbon reduction to promote sustainable development. In a disequilibrium economy, traders need to obtain quantitative information to adjust demand and supply based on market price. The specific form of quantity adjustment is a quota, and the transaction can be completed shortly[iii]. However, it is necessary to estimate the number of carbon reductions and transactions after the accounting of generated carbon reductions[iv]. In this case, for CAs both quota and credits can function well. SDM aims to promote long-term sustainable development, which indicates that the credit-based mechanism should be better.
Concerning the basic unit of the transaction, whether there are specific requirements or target restrictions on the industry level in various countries' performance targets shall be considered. At the G8 summit, a statement that establishing emission reduction plans for critical industries will help achieve GHGs reductions was mentioned[v]. Adding credit into the industry-based carbon market mechanism may help with the sustaining goal[vi].
The comparison among submitted INDCs expressed that the emission reduction industries involved are mainly from the emission industries in the IPCC national GHGs emission inventory. It is inappropriate for CAs to set limits at the industry level. Inappropriate amounts of industries covered may increase Parties' pressure of technic improvement and carbon reduction arrangements' integrity. A project-based mechanism may work well for CAs.
SDM plays an essential role in sustainable development. Specific industries have great potential for carbon reduction, so the industry-based mechanism is more suitable for SDM. On the one hand, the industry-based approach may avoid the situation where cross-border investment fails to meet sustainable development requirements more effectively. On the other hand, it can help regulate carbon emission reductions within the industry and further promote low-carbon development.
Coverage of the system
Additional file 1 shows 146 countries' willingness and efforts on carbon reduction. CO2, CH4, and N2O are contained in 43 INDCs, 15 INDCs control CO2, CH4, N2O, HFCs, PFCs, and SF6, 20 INDCs emission targets of CO2, CH4, N2O, HFCs, PFCs, SF6, and NF3. Although the number of Parties that contain seven types of GHGs is less than that of three types of GHGs. Countries containing seven types of GHGs are mostly developed countries that account for a large degree of international carbon market participation. Therefore, the article believes that CO2, CH4, N2O, HFCs, PFCs, SF6, and NF3 shall be covered in CAs. In this case, a standard unit of measurement that unifies different GHGs is required. Global Warming Potential (GWP) was accepted in the IPCC First Assessment Report and has been broadly used since UNFCCC and the Kyoto Protocol[vii]. In NDCs of Parties, GHGs were measured by carbon dioxide equivalent (CO2-eq), which indicates the unit is suitable to be widely used in CAs.
According to NDCs of Parties, most countries make efforts to decrease carbon emissions from energy, industrial processes, and transportation. However, various industries emit GHGs in various amounts and types. To achieve mitigation goals, CAs do not need to limit types of emission industries. A transaction may conduct if carbon emission/ reduction satisfies the requirements of subject matters.
As the difference of carbon emission and mitigation abilities among various industries, in the early stage of the implementation of SDM, only part of industries should be included. In annual reports of the International Energy Agency (IEA)[viii],[ix],[x],[xi], statistics on carbon emissions emitted by energy combustion activities indicates that the primary carbon emission industries were concentrated in power, heat, processing and manufacturing, construction and transportation industries. The Emissions Database for Global Atmospheric Research (EDGAR) shows that cement production emissions account for 80% of category 2A[xii]. It has been found that steel, copper, and aluminum contribute most to carbon footprint through life cycle analysis[xiii]. Blok[xiv] assesses emission reduction potential for agriculture, construction, energy, forestry, and other land use, industry, and transportation. The result presents that the energy industry has the most enormous carbon emission reduction potential (12.2 GtCO2e by 2030), approximately one-third of the global total reduction potential. Projects registered in CDM focuses on energy, waste management, and manufacturing[xv]. Dong[xvi] comes to a result that electricity production genetares the highest carbon emissions and has the highest carbon reduction potentials. Combining the above records with the 2006 IPCC Guidelines for National Greenhouse Gas Inventories, it turns out that cement production, steel, electricity, heat, construction, waste management, aluminum production, and forestry can represent most carbon emission industries and own considerable potential for carbon reduction.
The subject matter of SDM is emitted by relevant industries, indicating that the most gas emission types of subject industries in SDM shall be the subject matter. Table 1 shows the most gas emission types of the subject industries contained in SDM[xvii],[xviii]. As a result, CO2, CH4, N2O, and PFCs shall work as the subject matters in SDM. Similar to CAs, CO2-eq should be used as an accounting unit.
Table 1. Industries Covered in SDM and Related Gas Emission Types
Industry
|
Gas Types
|
Cement production
|
CO2
|
Steel
|
CO2
|
Electricity
|
CO2
|
Heat
|
CO2
|
Construction
|
CO2
|
Waste management
|
CO2, CH4, N2O
|
Aluminum production
|
CO2, PFCs
|
Additional file 2 concludes the basic characteristics of CAs and SDM. When it comes to transaction contents, CAs should transfer carbon emissions and reductions, but SDM should only transfer carbon reductions. Only countries with clear carbon reduction goals can transfer carbon reductions to ITMOs and then function in the market under CAs. SDM is available to Parties who voluntarily participated in the international market mechanism. Therefore, the subject matters of SDM can be included in ITMOs of CAs.
What's more, as the corresponding emission reduction results generated by the industry and gas types in SDM have been recognized at the international level, the emission reduction results generated can directly enter into the transaction and connect with CAs without re-accounting, thereby reducing transaction costs and streamline processes. Carbon offsets can compensate GHGs emissions through energy transfer, higher energy effectiveness, and forestry, which is regarded as an essential way in carbon mitigation and promoting sustainable development. It is a possible measure for carbon mitigation in CAs and SDM.
Explanation of the operational framework
For CAs
While designing the operational framework of CAs, it should be noted that: (ⅰ) the enterprise is the implementation body of various emission reduction activities, so the ignition of all projects, the start and end of emission/ reduction units should come from the enterprise; (ⅱ) CAs help Parties to achieve mitigation goals clearly defined in their INDCs. Therefore, participants must establish relevant departments responsible for registering emission/ reduction units; (ⅲ) whether the emission/ reduction units obey environmental integrity needs to meet the responsible agency's standards at the Paris Agreement[xix].
For Parties with bilateral/ multilateral cooperation agreements, ITMOs of the seller can be transferred to the buyer after verification by the institution set under the Paris Agreement. Compared to Parties with bilateral/ multilateral cooperation agreements, ITMOs information disclosure platform may allow interested Parties without bilateral/ multilateral cooperation agreements to register themselves in the system and then make carbon transaction inside the relevant system, like the carbon trading operational framework in the pilot phase of China's carbon market.
For SDM
Different from CAs, SDM ought to only transfer carbon emission reduction results. SDM can be invested by enterprises that want to obtain emission reduction credits and achieve certain technologies. Local enterprises shall submit applications to the government of the country first. Then, the applications shall be audited and reviewed by the agency set under the Paris Agreement. If meet the requirements, the project's approved emission reductions will be issued to the country's government where the Party locates, and then the government will release funds to the investor's enterprise.
The investing country's government should be included in the carbon emission reduction contribution of the investment enterprises. However, SDM should not be limited to foreign investment by developed countries. It shall have new stimuli and restrictions at the industry level, which is stricter than CDM. Industry associations shall be built to strengthen technical development for carbon emission and participate in carbon trading.
Summary of operation framework
For CAs, the verified ITMOs can be transferred from the sellers of the selling country to the buying country buyers through bilateral/ multilateral cooperation agreements or ITMOs information disclosure platform. For SDM, carbon reductions may be conducted through the industry-level platform between the host country and the investor country.
Coordination in the governance framework
For CAs
The World Bank classifies four scenarios of management for carbon market mechanism, namely fully decentralized (without any global standards), semi-decentralized (some minimal environmental standards provided by an international body as guidance), semi-centralized (must observe environmental standards but no approval required), and fully-centralized (global environmental standards must be observed, compliance under the Paris Agreement) scenario[xx]. Considering the requirements of ITMOs results in CAs, the article did not accept the suggestion put forward by the World Bank. Multi-level organizations and governance may be helpful for better function of carbon trading mechanisms[xxi]. The unit review should be carried out at the international level to ensure environmental integrity. However, other contents can be managed by regional/ sub-regional or domestic relevant agencies.
For Parties with bilateral/ multilateral cooperation agreements, there are two ways to measure the environmental integrity of selected ITMOs. The agency reviews one under the Paris Agreement, and a third-party agency reviews the other at the international level, which has been selected in this article. The former agency reviews subject matters submitted by the buyer's country's government following compliance requirements approved by the COP. The latter has been used in CDM. A total of 30 designated operating entities with rich experiences have conducted CDM project verification at present[xxii]. To meet the Paris Agreement's new standards, the third-party agencies only need to train for rules and characteristic standard requirements for emission reduction results in CAs. Compared to the former, the Paris Agreement only requires rulemaking at the international level and does not require specific review. For Parties interested in CAs without bilateral/ multilateral cooperation agreements, the ITMOs information disclosure platform should help them participate in carbon transactions. So, it is unnecessary to verify the business itself.
For SDM
SDM aims to discover more emission reductions and to promote sustainable development. As it has been proposed that SDM functions at the international level and the transaction units are authorized at the international level, the governance framework of SDM should adopt international uniform environmental standards. The emission reduction results shall be verified and approved at the international level as well. So, it is rational to choose a fully-centralized scenario as the governance model for SDM.
Similar to CAs, environmental integrity shall be enhanced and maintained in SDM. The critical issue of SDM is the coordination among the executive committee, industry associations, and third-party verification agencies at the international level to keep integrity and synchronicity[xxiii]. The industry associations at the international level should be composed of enterprises, non-governmental organizations, and individuals. Third-party organizations should function as the third-party organizations under CDM who assess carbon reduction results and post relevant reports[xxiv]. The COP needs to develop institutional rules and uniform sustainable environmental standards at the international level for Parties to comply. Furthermore, a unique agency under the Paris Agreement shall be established to manage SDM, responsible for reviewing and approving national proposals and the release of emission reductions during mechanism operation.
Summary of governance
Both CAs and SDM shall establish an independent agency to supervise carbon emissions and reductions[xxv]. The governance of CAs shall contain two-level: international auditing and regional/ sub-regional organization. The governance of SDM shall follow a fully-centralized scenario. At the international level, the executive committee, industry associations, and third-party verification agencies must work in high coordination to ensure carbon transaction validity.
Explanation of Implementation framework
While implementation, the operational framework and governance framework of carbon market flexible mechanisms shall ensure carbon transfer's effectiveness and rationality. To make the mechanisms more practical, it is beneficial to combine the operational framework with the governance framework. Thus, the article proposed an implementation framework for CAs and SDM, respectively, which develops the nine elements of the market mechanism to some extent.
For CAs
Under CAs, participating companies must come from Parties that have quantified emission reduction targets. Once the emission reduction results were approved, they shall be completely transferred from the seller to the buyer's government and used by the companies who bought. The implementation framework of CAs contains three stages (see Additional file 3):
The first stage: project preparation. Enterprises that intend to take part in CAs deliver emission reduction results to third-party for review. A compliance report of reduction results will then be issued to explain environmental integrity. Enterprises identify trade objects through bilateral/ multilateral cooperation agreements or ITMOs information disclosure platform.
The second stage: project submission & auditing. The compliance reports of ITMOs shall be delivered to the local government or the International Executive Committee for review. All information on transaction projects shall be announced to the public for questions.
The third stage: ITMOs transfer. After the government of both Parties and the International Executive Committee review, the two governments shall register the confirmed ITMOs on INDCs. Then the transaction can be done.
For SDM
Unlike CAs, the primary purpose of SDM is guiding and promoting sustainable development. Thus, whether or not the Party has proposed clear mitigation goals in INDCs, it can participate in carbon trading. Investors of different projects can obtain corresponding emission reduction credits after completing the project and calculate emission reduction units by the third-party agency. Accordingly, if the reduction credits are included in the host country's independent contribution, they should also be recorded and should not be counted as the host country's emission reductions. This rule is formed to prevent double accounting. The implementation framework of SDM was proposed to include three stages (see Additional file 4):
The first stage: project development & review. Enterprises of investing country first communicate with enterprises of the host country for local information and data. A project investment plan shall then be composed and assessed by a qualified third-party agency to ensure feasibility and compliance. After that, relevant reports may be posted to the local government. The project's host country shall submit all reports and project applications to the International Executive Committee for auditing and registering.
The second stage: project implementation & monitoring. Enterprises in the investing country need to regularly appoint a third-party agency to monitor emission reduction results during project implementation. The third-party agency shall measure and calculate actual emission reduction results according to the methods and standards of the sustainable verification of emission reduction results under the Paris Agreement. The host government and the Executive Committee shall record monitoring results and promptly indicate any problems.
The third stage: project acceptance & unit transfer. Based on the second stage, the project's actual emission reduction results shall faithfully comply with a report on the calculation of emission reduction results. The Executive Committee ought to issue corresponding emission reduction units to the investing country. Once the government of both transaction sides registered INDCs, enterprises in the investing country should obtain corresponding emission reduction units. Then the transaction can be done.
Summary of the implementation framework
By integrating the operational framework with the governance framework of CAs and SDM, the study analyzed the two mechanisms' implementation framework. The implementation framework of CAs ought to consist of project preparation, project submission & auditing, and ITMOs transfer. The implementation framework of SDM should be composed of project development & review, project implementation & monitoring, and project acceptance & unit transfer.