China and India Decline to Support Legacy UN Carbon Projects Driving Mass Cull of Transition Applicants

The global landscape of carbon trading has undergone a seismic shift following the expiration of a critical United Nations deadline, as China and India—historically the world’s largest suppliers of carbon offsets—opted not to endorse the vast majority of their legacy projects for transition into the new Paris Agreement framework. Analysis of official United Nations Framework Convention on Climate Change (UNFCCC) data reveals that nearly three-quarters of all projects and programs seeking to migrate from the old Clean Development Mechanism (CDM) to the new Article 6.4 mechanism have been effectively culled. By the June 30, 2024, deadline, only 415 projects out of more than 1,500 applicants secured the mandatory approval from their respective host governments, marking a definitive end to the era of Kyoto-style carbon accounting for many project developers.

This mass exclusion is primarily driven by the strategic decisions of Beijing and New Delhi. The two Asian economic giants, which together hosted two-thirds of all global CDM activities, declined to provide the necessary Letters of Approval (LoAs) for most of their aging carbon-offsetting initiatives. This move signals a significant pivot in how the world’s most populous nations view the international carbon market, prioritizing the integrity of future emissions reductions over the monetization of historical projects. In stark contrast, Brazil, another heavyweight of the CDM era, chose a different path, rushing to approve nearly all of its domestic projects in the final weeks leading up to the deadline. This has left Brazil with the largest remaining portfolio of activities eligible to sell credits under the new UN-led mechanism.

The Evolution of UN Carbon Markets: From Kyoto to Paris

To understand the magnitude of this shift, it is essential to examine the history of the Clean Development Mechanism. Established under the 1997 Kyoto Protocol, the CDM was designed to allow industrialized countries to meet part of their emission reduction targets by purchasing Certified Emission Reductions (CERs) from projects in developing nations. At its peak, the CDM spurred thousands of projects ranging from massive hydroelectric dams in China to wind farms in India and methane capture at landfills in Brazil.

However, the CDM eventually became a victim of its own success and a lack of rigorous oversight. By the mid-2010s, the market was flooded with credits, causing prices to collapse to pennies per tonne. More critically, carbon market watchers and environmental NGOs began to regard the CDM as largely discredited. Critics argued that many projects lacked "additionality"—the requirement that the project would not have happened without the financial incentive of carbon credits. A 2016 study commissioned by the European Commission suggested that up to 85% of CDM projects likely failed to provide real, measurable, and additional emission reductions.

With the adoption of the Paris Agreement in 2015, the international community sought to replace the CDM with a more robust system under Article 6.4. This new mechanism is intended to uphold higher standards of environmental integrity, ensure the avoidance of double-counting, and contribute to overall global mitigation rather than just offsetting. The transition process, which culminated in the June 30 deadline, was the bridge intended to allow high-quality CDM projects to continue operating under the new, stricter rules.

The Strategic Calculation of China and India

The refusal of China and India to back their legacy projects has surprised some market participants but aligns with broader domestic climate strategies. For China, the decision reflects a maturation of its domestic carbon market (the China Emissions Allowance or CEA) and a desire to move away from low-quality "junk" offsets that could undermine its international reputation. By not transitioning old projects, China ensures that its future participation in the Article 6.4 market is built on modern projects that utilize more advanced technology and more stringent baselines.

In India, the government has been increasingly focused on developing its own domestic Carbon Credit Trading Scheme (CCTS). Indian policymakers have expressed a desire to keep high-quality emission reductions within the country to help meet India’s own Nationally Determined Contributions (NDCs) under the Paris Agreement. Allowing millions of legacy credits to be exported to international buyers could make it more difficult and expensive for India to meet its own climate targets, as those reductions would no longer count toward the national total.

Furthermore, both nations are aware of the "hot air" problem. If the new UN market were flooded with old credits from projects that were registered ten or fifteen years ago, the price of new, more innovative carbon removal and reduction projects would likely be suppressed. By clearing the deck of these legacy projects, China and India are effectively making room for a new generation of higher-value carbon credits.

Brazil’s Counter-Strategy and the Risk of Market Saturation

Brazil’s decision to approve almost all of its 180 transition requests stands in sharp contrast to its BRICS counterparts. Brazilian officials have historically defended the CDM and the rights of project developers to see their investments through. By approving these projects, Brazil is positioning itself as the primary supplier in the early stages of the Article 6.4 market.

However, this strategy carries significant risks. If Brazil’s projects are perceived by international buyers as being of lower quality or lacking additionality, they may struggle to find a market, or they may trade at a significant discount. There is also the broader risk to the Article 6.4 mechanism itself. Carbon market analysts have warned that letting too many "zombie" projects from the Kyoto era live on could dent corporate and sovereign confidence in the new UN-sanctioned market.

The scale of the potential oversupply is immense. According to UN estimates, if all 1,500 projects had successfully transitioned, they could have released more than 900 million credits into the market. Since one credit represents one tonne of CO2, this volume is equivalent to the total annual greenhouse gas emissions of Japan, the world’s fifth-largest emitter. A sudden influx of 900 million tonnes of supply could have crashed prices before the Article 6.4 market even became fully operational.

A Timeline of the Transition Process

The journey from the CDM to Article 6.4 has been a multi-year diplomatic and technical marathon:

• December 2015: The Paris Agreement is signed, including Article 6, which outlines the framework for international cooperation on carbon markets.
• November 2021: At COP26 in Glasgow, negotiators finally agree on the "Rulebook" for Article 6, setting the criteria for how CDM projects can transition.
• January 2024: The UNFCCC opens the formal window for project developers to submit transition requests.
• June 30, 2024: The hard deadline for host country governments to provide Letters of Approval for transitioning projects. Projects without an LoA by this date are officially excluded from the transition.
• Late 2024 – 2025: The Article 6.4 Supervisory Body is expected to finalize the methodologies that will govern the issuance of new credits, known as A6.4ERs.

Industry Reactions and Market Implications

The reaction from the private sector has been mixed. Project developers who spent years managing CDM assets in China and India now face the reality that their investments may have no further value in the UN system. Some of these developers have expressed frustration, noting that they followed the rules of the time and have been left stranded by a sudden change in political will.

Conversely, environmental advocacy groups and institutional investors have largely welcomed the cull. "This is a necessary cleansing of the system," said one carbon market analyst based in London. "The integrity of the Paris Agreement depends on the world moving past the flaws of the Kyoto era. If we want a carbon price that actually drives industrial decarbonization, we cannot have a market built on the foundations of old, questionable credits."

The implications for the broader voluntary carbon market (VCM) are also significant. Many corporate buyers have already moved away from CDM credits in favor of newer standards like Verra’s Verified Carbon Standard (VCS) or the Gold Standard. The mass cull of CDM projects in the UN system reinforces the trend toward higher quality and more recent "vintages" of carbon credits.

Looking Ahead: The Future of Article 6.4

The reduction of the transition pipeline from 1,500 projects to just 415 has fundamentally changed the starting point for the Article 6.4 mechanism. Rather than starting with a massive surplus of legacy credits, the market will now begin with a much leaner and potentially more credible portfolio.

However, challenges remain. The Article 6.4 Supervisory Body must still determine exactly how the 415 approved projects will be re-evaluated under the new, stricter methodologies. Even though they have government approval, they must still prove they meet the updated standards for additionality and baseline setting.

The decision by China and India to step back from the legacy market may also signal a shift toward bilateral agreements under Article 6.2. This parallel mechanism allows countries to trade emission reductions directly with one another through customized agreements. Both countries may find more value in these bespoke deals—such as selling high-quality credits to Singapore, Japan, or South Korea—than in the broad, standardized UN market.

In conclusion, the 30 June deadline marks a turning point in the history of climate finance. By declining to back their old CDM projects, China and India have prioritized the long-term credibility of the global carbon market over short-term financial gains for legacy developers. While Brazil’s massive approval spree keeps the ghost of the CDM alive for now, the overall "cull" of nearly 75% of applicants suggests that the new UN carbon market will be a significantly more exclusive and, hopefully, more effective tool in the global fight against climate change. The world now waits to see if this smaller, more refined pool of projects can generate the high-integrity credits needed to incentivize real atmospheric change.