Trend watch: Voluntary carbon market integrity (ICVCM, VCMI) in 2026 — signals, winners, and red flags

The voluntary carbon market (VCM) entered 2026 at a crossroads. After years of credibility crises driven by investigative reporting on questionable offsets, inflated baselines, and dubious additionality claims, two governance bodies now anchor the market's attempt to rebuild trust: the Integrity Council for the Voluntary Carbon Market (ICVCM) and the Voluntary Carbon Markets Integrity Initiative (VCMI). Together, they define what constitutes a high-quality carbon credit and how companies can credibly use those credits within their climate strategies. The stakes are substantial. The VCM transacted approximately $1.7 billion in 2025, down from its 2021 peak of $2 billion but showing signs of recovery as integrity frameworks mature and buyer confidence stabilizes.

Understanding the signals, winners, and risks in this evolving landscape is essential for any organization purchasing carbon credits, developing carbon credit projects, or advising clients on voluntary climate commitments.

Why It Matters

The voluntary carbon market serves a unique function in global climate finance. Unlike compliance markets such as the EU Emissions Trading System or California's cap-and-trade program, the VCM operates without regulatory mandates, relying instead on corporate ambition, stakeholder pressure, and voluntary standards to drive demand. This flexibility allows the VCM to channel capital toward project types and geographies that compliance markets do not reach, including nature-based solutions in developing countries, direct air capture facilities, and community-level clean energy projects.

However, the market's voluntary nature also makes it vulnerable to integrity failures. A series of investigations by The Guardian, Die Zeit, and SourceMaterial in 2023 revealed that over 90 percent of rainforest carbon offsets certified by Verra, the market's largest standard, were likely "phantom credits" that did not represent genuine emissions reductions. The fallout was severe. Verra's CEO resigned, corporate buyers including Shell, Gucci, and EasyJet scaled back or paused offset purchasing, and the market's total transaction value declined 20 percent year over year.

The ICVCM and VCMI emerged from this crisis with complementary mandates. The ICVCM sets quality thresholds for carbon credits through its Core Carbon Principles (CCPs), defining requirements for additionality, permanence, robust quantification, and sustainable development contributions. The VCMI establishes guidelines for how companies can use carbon credits within their climate strategies through its Claims Code of Practice, ensuring that credit purchases supplement rather than substitute for direct emissions reductions.

The convergence of these frameworks with Article 6 of the Paris Agreement, which governs international carbon trading between nations, creates a 2026 landscape where integrity standards are simultaneously tightening, fragmenting, and being tested at scale for the first time.

Key Signals

ICVCM Core Carbon Principles Reshape Supply

The ICVCM completed its initial assessment of carbon crediting programs in late 2025, applying CCP labels to credits that meet ten integrity criteria spanning governance, emissions impact, and sustainable development. By January 2026, four crediting programs had received CCP-eligible status for specific methodologies: Verra's Verified Carbon Standard (selected REDD+ and renewable energy methodologies), Gold Standard (clean cooking and methane avoidance), the American Carbon Registry (landfill gas and ozone-depleting substance destruction), and the Architecture for REDD+ Transactions (jurisdictional REDD+).

The practical effect is a bifurcation of supply. Credits carrying the CCP label trade at premiums of $3 to $8 per tonne above non-CCP equivalents, with nature-based CCP credits averaging $12 to $18 per tonne compared to $4 to $7 for unlabeled credits from similar project types. This price differentiation signals that the market is beginning to reward quality, but it also compresses margins for project developers whose methodologies have not yet been assessed or fail to qualify.

Approximately 35 percent of existing VCM supply is estimated to be CCP-eligible based on methodology assessments completed through early 2026, leaving the majority of outstanding credits in an uncertain category. Project developers face pressure to either align with CCP requirements or accept discounted pricing.

VCMI Claims Code Gains Corporate Adoption

The VCMI's Claims Code of Practice, finalized in late 2024, defines three tiers of credible corporate use: Silver (meeting near-term science-based reduction targets plus offsetting residual emissions), Gold (meeting targets plus purchasing high-quality credits equivalent to at least 20 percent of unabated emissions), and Platinum (meeting targets plus purchasing credits equivalent to 100 percent of remaining emissions). All tiers require that companies have validated science-based targets and demonstrate year-over-year progress on direct reductions before making any claims involving carbon credits.

By early 2026, over 80 companies had registered to use the VCMI Claims Code, including Unilever, Nestle, Microsoft, and Salesforce. Adoption is concentrated among large multinationals with existing science-based targets and dedicated sustainability teams. The Code explicitly prohibits the use of terms like "carbon neutral" or "net zero" without meeting the full requirements, including verified reduction progress, creating a compliance burden that smaller organizations find challenging.

The VCMI framework's most significant contribution may be its requirement that credit purchases are additional to, not substitutes for, direct emissions reductions. This principle addresses the central criticism that carbon offsets allow companies to claim climate leadership while avoiding the more expensive and operationally complex work of decarbonizing their own operations.

Article 6 Implementation Creates Jurisdictional Complexity

Article 6 of the Paris Agreement, operationalized at COP28 in Dubai, introduces corresponding adjustments to prevent double counting of emissions reductions traded between countries. When a carbon credit generated in Country A is sold to a buyer in Country B, Country A must add those emissions back to its national inventory while Country B subtracts them. This mechanism ensures that global emissions accounting remains accurate but introduces significant operational complexity for voluntary market participants.

Several host countries, including Indonesia, Papua New Guinea, and India, have imposed restrictions on the export of carbon credits, either requiring government authorization for international transfers or reserving portions of credit revenues for domestic climate finance. These restrictions have reduced available supply in some of the VCM's most active geographies, contributing to price volatility and supply uncertainty.

The interaction between Article 6 requirements and voluntary market standards remains partially unresolved. Credits used for voluntary corporate claims may or may not require corresponding adjustments depending on the host country's policies, the crediting program's rules, and the buyer's intended use. This ambiguity creates compliance risk for corporate buyers and reputational risk for the market as a whole.

Emerging Winners

High-integrity project developers focused on removal-based credits, particularly direct air capture (DAC), biochar, enhanced rock weathering, and afforestation with robust monitoring, are commanding premium prices. Removal credits with CCP labels trade at $50 to $200+ per tonne, compared to $5 to $15 for avoidance credits. Companies like Climeworks, Running Tide, and Charm Industrial have secured multi-year offtake agreements at prices that support continued scaling.

Digital MRV (Monitoring, Reporting, and Verification) providers that use satellite imagery, remote sensing, and machine learning to verify carbon credit claims are capturing growing market share. Pachama, Sylvera, and BeZero Carbon have become essential infrastructure for buyers conducting due diligence on credit quality. Their ratings and assessments increasingly influence purchasing decisions, functioning as de facto quality filters.

Jurisdictional REDD+ programs that align with Article 6 corresponding adjustment requirements and demonstrate government-backed additionality are emerging as preferred sources of nature-based credits. Programs in Costa Rica, Ghana, and Guyana that operate at national or subnational scales offer stronger permanence guarantees than project-level REDD+ credits and align more naturally with host country climate commitments.

Corporate advisory firms specializing in VCMI Claims Code compliance and carbon credit portfolio construction are experiencing rapid demand growth. The complexity of navigating ICVCM, VCMI, and Article 6 requirements simultaneously has created a consulting market estimated at $400 to $600 million annually, with firms like South Pole, Climate Impact Partners, and Trove Research expanding their integrity advisory practices.

Red Flags

Market Fragmentation Risk

The proliferation of integrity standards, national regulations, and crediting program requirements risks creating a fragmented market where buyers cannot easily compare credits across jurisdictions and methodologies. If CCP assessments proceed slowly or produce inconsistent results across crediting programs, buyers may retreat to bilateral deals with trusted developers rather than purchasing through open exchanges, reducing market liquidity and price transparency.

Greenwashing Litigation Exposure

Companies making climate claims backed by carbon credits face increasing litigation risk. The European Commission's Green Claims Directive, expected to enter force in 2026, will require companies to substantiate environmental claims with verified evidence and prohibits claims of climate neutrality based solely on offsets. Similar regulatory actions in the United States, including Federal Trade Commission scrutiny of "carbon neutral" marketing, create legal exposure for companies using credits without rigorous adherence to VCMI or equivalent frameworks.

Supply Squeeze from Corresponding Adjustments

As more host countries implement Article 6 corresponding adjustments, the available supply of internationally transferable credits may contract significantly. Analysis by Trove Research estimates that corresponding adjustment requirements could reduce effective VCM supply by 30 to 50 percent by 2028 if major host countries restrict credit exports. This supply constraint, combined with growing demand from companies aligning with integrity frameworks, could produce sharp price increases that test buyer willingness to pay.

Integrity Fatigue Among Buyers

The complexity of the evolving integrity landscape risks creating decision paralysis among corporate buyers. Organizations must now evaluate credits against CCP criteria, assess methodology-level eligibility, verify corresponding adjustment status, align purchases with VCMI Claims Code tiers, and defend these decisions against media and NGO scrutiny. Some buyers report that the compliance burden has become disproportionate to the reputational and climate benefits of VCM participation, leading them to redirect budgets toward direct emissions reduction investments instead.

What to Watch Next

The pace of ICVCM methodology assessments will determine whether the CCP framework achieves sufficient coverage to become the market's universal quality benchmark. If assessments remain slow, the market will continue operating with a large proportion of unrated credits, undermining the framework's intended effect.

The interplay between the VCMI Claims Code and emerging regulatory requirements, particularly the EU Green Claims Directive, will test whether voluntary governance frameworks can satisfy mandatory disclosure standards. Alignment would reinforce the VCM's credibility; divergence would create costly duplication for corporate participants.

The development of a functioning Article 6 registry infrastructure, enabling transparent tracking of corresponding adjustments across borders, represents a critical technical and political challenge. Without reliable registry systems, double counting risks will persist and undermine the environmental integrity that the entire framework is designed to protect.

Action Checklist

• Audit existing carbon credit portfolios for CCP eligibility and identify credits that may lose value as integrity standards tighten
• Evaluate alignment with the VCMI Claims Code and determine which tier (Silver, Gold, Platinum) is achievable given current reduction trajectories
• Assess corresponding adjustment requirements for credits sourced from Article 6-implementing countries
• Engage digital MRV providers such as Sylvera, Pachama, or BeZero to independently rate credit quality before purchase
• Review marketing and sustainability claims for compliance with the EU Green Claims Directive and FTC guidelines
• Diversify credit sourcing across project types and geographies to mitigate supply concentration risk
• Establish internal governance for carbon credit procurement, including quality thresholds, due diligence protocols, and claim substantiation procedures
• Monitor ICVCM methodology assessment timelines and adjust procurement strategy as new categories receive CCP eligibility

Sources

• Integrity Council for the Voluntary Carbon Market. (2025). Core Carbon Principles Assessment Framework: Implementation Report. London: ICVCM.
• Voluntary Carbon Markets Integrity Initiative. (2025). Claims Code of Practice: Guidance for Corporate Use of Carbon Credits. London: VCMI.
• Ecosystem Marketplace. (2025). State of the Voluntary Carbon Markets 2025. Washington, DC: Forest Trends.
• Trove Research. (2026). Impact of Article 6 Corresponding Adjustments on Voluntary Carbon Market Supply. Oxford: Trove Research.
• West, T.A.P. et al. (2023). "Action Needed to Make Carbon Offsets from Forest Conservation Work for Climate Change Mitigation." Science, 381(6660), 873-877.
• European Commission. (2025). Green Claims Directive: Regulatory Impact Assessment. Brussels: European Commission.
• BloombergNEF. (2025). Long-Term Carbon Offset Outlook: Pricing, Supply, and Integrity. New York: Bloomberg LP.