Why Chinese Carbon Credits Became a Test Case for Integrity in Europe
Chinese carbon credits became a test case because the real issue is integrity, not geography. The friction starts when credits created in a domestic or legacy market are judged by European buyers against stricter expectations for additionality, MRV, registry transparency, and claim substantiation.
The EU ETS no longer allows international credits for compliance after 2020, so the flow into Europe is mainly voluntary, corporate, or aviation-adjacent rather than pure allowance compliance. That matters because buyers are often operating in mixed portfolios where the line between compliance logic and voluntary claims can get blurry.
CORSIA makes the quality question even sharper. ICAO still maintains the list of CORSIA Eligible Emissions Units in 2025, and CDM remains relevant only for specific windows and unit types. For aviation-linked buyers, legacy Chinese credits are not just old assets. They are a benchmark for whether a unit can survive a stricter eligibility screen.
That is why the buyer set is broad. Utilities, airlines, freight forwarders, SAP and ERP procurement teams, and OTC intermediaries all have to decide whether to accept CERs, CCERs, or voluntary units in mixed portfolios. They also have to explain why one credit is priced far below a premium unit if the claim is supposed to stand up to scrutiny.
The reputational stakes are higher than they were a few years ago. In 2024, the market became much more sensitive to greenwashing risk, so buyers are no longer purchasing only tCO2e. They are also buying auditability, defensibility, and regulatory resilience.
That is the real setup for the next question. If the problem is not simply “Chinese credits,” but whether a credit is genuinely additional, then CDM-era and post-2020 units become much harder to trust.
The Additionality Problem: What Makes CDM-Era and Post-2020 Credits Hard to Trust
Additionality was already a formal test under the CDM, but that does not make every CDM-era credit credible today. The buyer problem is that many projects passed older methodologies without having to prove a clear business-as-usual gap under today’s expectations.
The transition is getting stricter in 2025. Gold Standard has tied the CDM-to-new-framework shift to a methodological deadline, with CDM methods usable only until the end of the crediting period or 31 December 2025 for some activities. After that, a methodology approved under the new framework is needed.
Supply-side risk is not theoretical. Verra has also flagged overissuance issues in rice projects in China and has moved against projects with eligibility problems. That is a reminder that issuance quality can fail before the credit even reaches the market.
Post-2020 credits are not automatically better either. A newer vintage does not remove the need to check baseline inflation, leakage, permanence, regulatory surplus, or stacking with other incentives. A project can look modern on paper and still be weak on integrity.
This matters in practical B2B settings. An industrial buyer using credits for SBTi-aligned claims needs a defensible additionality story. A trader trying to reverify vintage needs to know whether the unit still fits the claim. A developer using carbon finance in an IRR model needs to know whether the credit will actually hold up in due diligence and bankability checks.
The key point is simple. If additionality is fragile, then the next issue is not just quality in theory. It is how the credit moves through the supply chain, who validates it, who retires it, and where controls can disappear.
How Credits Move Through EU ETS-Adjacent and CORSIA Supply Chains
The typical path is straightforward, but the risk grows at each step. A project issues credits, the units sit in a registry account, a broker or aggregator trades them OTC, and the buyer retires them. Quality often degrades when credits move from a local registry into an international intermediary chain.
EU ETS-adjacent is not the same as EU ETS compliance. International credits do not enter EU ETS compliance after 2020, but they can still circulate in corporate supply chains and aviation offsetting. That is where confusion can arise, especially when buyers assume that anything carbon-related has the same regulatory status.
CORSIA makes the bifurcation even clearer. ICAO updates the list of eligible programs regularly, and in 2025 the acceptable units depend on the program, vintage, and compliance period. The market is effectively split between eligible units and everything else.
The data environment is also tightening. ICAO said that in 2024 emissions data covered 99% of the CO₂ in the dataset submitted by 128 States. That points to a more data-driven aviation market and less tolerance for opaque units.
The supply-chain risk is not only double counting. It is also chain-of-custody failure, missing cancellation evidence, and credits being repackaged or relabeled in ways that make the claim hard to defend. If a broker sells a unit with ambiguous retirement language, the buyer may end up with a claim that is weak even if the credit itself was once valid.
That is why procurement teams need a harder filter. The market no longer rewards buyers who simply say they bought carbon credits. It rewards buyers who can explain why these credits, from where, and under what rules.
The Due Diligence Checklist Procurement Teams Need Before Buying
The minimum checklist is issuer, methodology, vintage, host-country authorization, registry status, retirement evidence, and corresponding adjustment where applicable. Without those fields, the audit trail is too weak for a serious buyer.
Serious buyers also ask for the underlying evidence, not just a PDF certificate. They want the additionality test, baseline assumptions, leakage analysis, monitoring report, and the validation or verification body. A broker bridge letter is not enough on its own.
Price is a useful warning signal. A very low price versus the market median, incomplete documentation, old vintages, obsolete methodologies, or project types already under scrutiny should trigger legal and compliance escalation.
The market is also moving toward stronger integrity filters. In 2024 and 2025, CCP and quality labels became more relevant, which makes it more important for procurement, legal, ESG, and finance teams to work from a shared credit acceptance policy.
A practical way to do that is to build a matrix. Separate avoidance from removal, project-based from jurisdictional, pre-2020 from post-2020 vintage, and compliance use from voluntary use. That gives multi-site buyers a clearer way to decide what can be accepted and what needs escalation.
The main lesson is that procurement can no longer treat carbon credits as a generic commodity. It has to treat them as a controlled input with documented quality thresholds.
What Stronger Buyer Standards Could Mean for the Next Phase of Carbon Market Demand
Stronger buyer standards can shift demand away from volume and toward quality-adjusted demand. That tends to favor projects with solid MRV, credible additionality, and better readiness for corporate and aviation claims.
The 2025 policy context points in that direction. Gold Standard has published updated guidance for regulating carbon markets, while UNFCCC and ICAO continue to tighten traceability and eligibility requirements. The direction of travel is toward more selective markets.
That change matters for developers. Those who do not adapt risk discount pricing, exclusion from buyer lists, and weaker offtake prospects. Those who do adapt can win premium contracts, longer tenors, and more trust from counterparties.
It also matters for market design. Stronger buyer standards can increase demand for tokenised credits, registry interoperability, digital MRV, and automated retirement evidence. But tokenisation only helps if it sits on top of real integrity. It cannot replace substance.
The quality gap will not disappear. What can change is who benefits from it. The future of demand is not just about how many tonnes are compensated, but how much integrity proof can survive review by auditors, regulators, and customers.
