90% of Carbon Credits Were Worthless. The Other 10% Built an $88 Billion Market.
The voluntary carbon credit market cratered from $2 billion to $723 million after investigators found most offsets were phantom reductions. Meanwhile, the EU's compliance market quietly became the world's most effective climate policy instrument at €70 per tonne.
In January 2023, The Guardian, Die Zeit, and SourceMaterial published a nine-month investigation into Verra, the world's largest carbon credit certifier. They examined a significant share of Verra's rainforest offset projects and found that more than 90% of the credits were "phantom credits" — paper reductions that didn't represent real carbon savings. A parallel analysis of a 2022 University of Cambridge study found that Verra projects had overstated the threat to forests by roughly 400% on average.
Verra had issued more than one billion credits since 2009. Gucci, Shell, easyJet, BHP, Salesforce, and Pearl Jam were among the buyers.
The market cratered.
The Collapse in Three Numbers
| Year | VCM Value | Volume (MtCO₂e) | Avg Price/Ton | Key Event |
|---|---|---|---|---|
| 2021 | ~$2.0B (peak) | ~500 Mt | $4.04 | Post-Glasgow euphoria |
| 2022 | ~$1.9B | ~260 Mt | $7.37 (+82%) | Price spike, volume crash |
| 2023 | $723M | ~115 Mt (-56%) | $6.53 | Verra scandal breaks |
| 2024 | ~$540M (est.) | ~86 Mt (-25%) | ~$6.17 (-5.5%) | Retirements fall 7% |
From peak to trough: a 73% volume drop and a 64% value collapse. The entire voluntary carbon market — the thing every Fortune 500 company touted in their sustainability reports — shrank to the size of a mid-tier tech acquisition.
What Went Wrong: A Taxonomy of Fraud
Not all offsets failed the same way.
REDD+ forestry projects were the worst offenders. The premise was simple: pay landowners in developing countries not to cut down trees. The problem was measuring what would have happened without the payment — the "counterfactual baseline." Project developers systematically inflated deforestation risk to generate more credits. Cambridge researchers found baselines overstated by 400%. A project claiming to save 10 million tonnes of forest carbon might have actually saved 600,000 tonnes. The other 9.4 million were pure accounting fiction.
South Pole, the world's largest carbon credit developer, exited its flagship Kariba REDD+ project in Zimbabwe in October 2023 after questions about credit quality. CEO Renat Heuberger departed shortly after. The Kariba project alone had issued millions of credits.
Renewable energy credits in developing countries were the next domino. Many funded wind and solar projects that would have been built anyway — they were already cheaper than fossil alternatives. The "additionality" was zero. You were paying for something the market was going to do for free.
Cookstove projects. Soil carbon. Mangrove restoration. Category after category collapsed under scrutiny. Not because the underlying activities were bad — planting mangroves is great — but because the measurement and verification machinery was built to generate credits, not verify reductions.
Meanwhile, in Brussels: €70 per Tonne
While the voluntary market was imploding, the EU Emissions Trading System was doing what carbon markets are supposed to do.
| Metric | EU ETS | Voluntary Market |
|---|---|---|
| Market size (2024) | ~$87.7B | ~$540M |
| Price/ton (Mar 2026) | €70.47 | ~$6 |
| Enforcement | Legal requirement, fines | Voluntary, honor system |
| Measurement | Actual emissions data | Estimated counterfactuals |
| Sectors | Power, industry, aviation, shipping | Anything that can claim a credit |
| Emissions trajectory | Down 47% from 2005 baseline | Unknown |
The EU ETS price sat at €70.47 per tonne of CO₂ as of March 12, 2026. That's a real price paid by real companies for the legal right to emit. With shipping now included in the system as of 2024, and the annual cap on allowances ratcheting down, some forecasts project €400–500/ton by mid-century. One maritime analyst told the trade press he "would not be surprised if prices temporarily exceed €1,000 per tonne in certain periods."
The compliance market size — Europe alone valued at $87.7 billion in 2024 according to Global Market Insights — dwarfs the voluntary market by a factor of 160.
And it's working. EU ETS-covered emissions dropped 47% from 2005 levels. Not because companies got altruistic. Because emitting got expensive.
The Border Problem
The Carbon Border Adjustment Mechanism (CBAM) is the EU's answer to carbon leakage — the risk that high domestic carbon prices simply push manufacturing to countries with no carbon cost. CBAM requires importers of steel, cement, aluminum, fertilizer, hydrogen, and electricity to purchase certificates matching the EU ETS price for the embedded carbon in their products.
The transitional reporting phase began January 2024. Full financial obligations kick in January 2026. This is the mechanism that turns a European carbon price into a global one — if you want to sell steel to the EU, you pay the EU carbon price regardless of where you smelted it.
India, Turkey, and Mozambique are the most exposed non-EU exporters. China, already running its own national ETS (covering power generation), has signaled it will expand coverage to stay aligned.
What's Surviving in the Voluntary Market
The voluntary market didn't die. It bifurcated.
Credits from engineered carbon removal — direct air capture (Climeworks, Heirloom), enhanced weathering, biochar — held their value. A Climeworks credit still sells for over $1,000/ton. Microsoft's $200 million in advance carbon removal purchases weren't shaken by the Verra scandal because the underlying mechanism is different: you're measuring actual CO₂ captured and stored, not estimating what a forest might have done.
The Integrity Council for the Voluntary Carbon Market (ICVCM) launched its Core Carbon Principles (CCPs) assessment framework in 2024, attempting to separate real credits from phantom ones. The intent is a quality label — CCP-approved credits trade at a premium while the garbage gets zeroed out.
Early results suggest the surviving market will be smaller but real. Forest Trends' Ecosystem Marketplace found that credit retirements fell to 157 million tonnes in 2025 — down 7% from 169 million in 2024 — but buyers increasingly concentrated on higher-priced, higher-integrity credits. Quality over quantity.
California: The American Compliance Story
The US doesn't have a national carbon price. But California does. The cap-and-trade program, run by the California Air Resources Board, covered about 400 million tonnes of CO₂e in 2024. Allowance prices have climbed past $40/ton, with a price floor that increases 5% plus inflation annually.
California's system is smaller than the EU ETS but follows the same logic: a legal cap, tradable allowances, declining supply, mandatory participation. It's linked with Quebec's market — making it technically the first international compliance system in North America.
Washington state launched its cap-and-invest program in January 2023 but voted to repeal it in November 2024 (Initiative 2117). Oregon's Climate Protection Program faced legal challenges and was effectively suspended. The American state-level picture is messy, contested, and highly dependent on election cycles.
The Price That Matters
There are now two distinct carbon economies operating on Earth.
The compliance economy: legally enforced, measured in actual emissions, priced at $40–70+/ton, covering billions of tonnes, and demonstrably reducing emissions.
The voluntary economy: opt-in, measured in estimated counterfactuals, priced at $6/ton average, covering tens of millions of tonnes, and unable to prove aggregate impact.
The delta between €70 (what the EU forces you to pay) and $6 (what the voluntary market charges) is the precise dollar value of accountability. When compliance is optional, the price of carbon approaches the price of a good story. When compliance is mandatory, carbon has a real cost, and emissions go down.
This isn't an indictment of the concept of carbon markets. It's an indictment of the specific architecture that allowed developers to self-report, verifiers to rubber-stamp, and buyers to announce "carbon neutral" on the basis of credits that a nine-month investigation found were 90% worthless.
The EU ETS works because it measures outputs, not intentions. Because the cap declines by law. Because the penalty for non-compliance is €100/tonne plus the obligation to surrender the missing allowances the next year.
The Bottom Line
The voluntary carbon market's collapse was a cleansing event. The phantom credits are being burned out by sunlight — Guardian investigations, ICVCM standards, buyer skepticism. What survives will be smaller, more expensive, and actually connected to physical carbon removal. The compliance market, meanwhile, is the quiet story nobody writes about because "EU regulatory mechanism works as designed" isn't a headline. But $87.7 billion in real carbon costs, covering sectors that account for 40% of EU emissions, with a 47% reduction from baseline — that's the carbon market that matters. The one priced at €70/ton, not $6.
Sources & References
- The Guardian — Revealed: More Than 90% of Rainforest Carbon Offsets by Biggest Certifier Are Worthless (January 2023). Nine-month investigation with Die Zeit and SourceMaterial.
- Ecosystem Marketplace — State of the Voluntary Carbon Markets 2023. Average credit price rose from $4.04/ton (2021) to $7.37/ton (2022), an 82% increase.
- Forest Trends / Ecosystem Marketplace — VCM Contracted in 2023. Total transaction value dropped to $723 million, volume fell 56%.
- Forest Trends — 2025 Benchmark Report: VCM in Transition. 2024: volumes down ~25%, prices down 5.5%, retirements fell to 157 Mt in 2025.
- LSE — The Verra Scandal Explained. University of Cambridge analysis: threat to forests overstated by ~400% on average.
- Global Market Insights — Europe Compliance Carbon Credit Market. EU compliance market valued at $87.7 billion in 2024, projected 14.2% CAGR to 2034.
- OilPriceAPI — Live EU ETS Carbon Price. EU ETS price: €70.47/tCO₂ as of March 12, 2026.
- Open Access Government — EU ETS Drives Emissions Down (2025 Report). EU ETS-covered emissions reduced ~47% from 2005 baseline levels.
- Sustainable Ships — EU ETS Price Forecast (2026). Shipping included in EU ETS; forecasts range to €400–500/ton long-term, potentially exceeding €1,000 in tight supply periods.
- Carbon Herald — The Guardian Investigation of Verra. Verra issued 1 billion+ credits since 2009; Shell, Gucci, easyJet among buyers.
- OPIS — California Carbon Market Cap-and-Trade. California allowance prices above $40/ton, linked with Quebec market.
- Senken — ICVCM Core Carbon Principles Explainer. CCP assessment framework launched 2024 to label high-integrity credits.