How do voluntary carbon markets price the co-benefits of biochar?

Title

How the Voluntary Carbon Market Prices the Co-Benefits of Biochar

Description

The latest research shows that biochar carbon credits are priced not only for their carbon removal attribute, but also for the sustainable development co-benefits they claim to deliver, which earn them a market premium. As novel carbon dioxide removal (CDR) gradually enters corporate net-zero procurement and the voluntary carbon market, how to verify these co-benefits is becoming an important issue for market integrity.

Abstract

A Nature-related paper points out that, in biochar carbon credit transactions through 2024, there is a discernible correlation between co-benefit claims and prices. Using a hedonic pricing approach to assess how Sustainable Development Goal (SDG) claims are reflected in credit prices, the study finds that: for every 1% increase in co-benefit claims, the average price of biochar carbon credits rises by 0.14%. Further breakdown shows that economic co-benefit claims are more likely to command a price premium, while environmental claims are instead associated with lower prices. The core implication of the study is that the market is paying for the combination of “carbon removal + co-benefits,” but this requires stricter auditing, verification, and information transparency; otherwise, co-benefits are likely to become price signals rather than real performance.

Main Text

Industry Background

Under the global net-zero pathway, carbon removal is moving from a peripheral issue to the mainstream of climate strategy. The IPCC and related research generally believe that, to achieve long-term net-zero targets, large-scale CO2 removal will still be needed in the future to deal with residual emissions that are difficult to eliminate. At the same time, corporate net-zero commitments, the Science Based Targets framework, and voluntary climate initiatives are channeling part of the demand into the voluntary carbon market.

In this market, biochar is one of the most closely watched novel carbon removal methods. It uses the carbon absorbed by plants through photosynthesis and sequesters it in a relatively stable form after pyrolysis. Compared with some purely engineered carbon removal solutions, biochar is usually easier to combine with agriculture, soil improvement, and certain ecological goals, so it is often seen as a pathway with more co-benefits.

The significance of this study is that it no longer asks only whether biochar can remove carbon, but goes further to ask: is the market willing to pay for its additional SDG co-benefits? If the answer is yes, then co-benefits are not just policy language, but will become an actual pricing factor.

Current Developments

This study focuses on the trading performance of biochar carbon credits in the voluntary carbon market and uses hedonic pricing methods to analyze transaction data through 2024, examining how different co-benefit claims affect prices. The authors map SDG-related claims into three sustainability dimensions: environmental, economic, and social, and observe their relationships with prices.

The findings show:

• There is a positive correlation between co-benefit claims and price;
• For every 1% increase in co-benefit claims, the average price rises by 0.14%;
• Economic claims tend to bring higher prices;
• Environmental claims are associated with lower prices.

This result shows that the voluntary carbon market is not pricing only the “tonnage.”This result shows that the voluntary carbon market does not price only “tonnage.” When assessing projects, buyers are increasingly placing importance on added value beyond emissions reduction/removal, such as agricultural benefits, local economic development, community development, or a broader sustainable development narrative. For biochar projects, claims of co-benefits may be becoming an important variable influencing deals.

But this does not mean that all co-benefits have been proven. On the contrary, the study explicitly stresses that since the market is willing to pay for these claims, they must be audited to confirm their authenticity and prevent the problem of “many claims, little evidence” from eroding market trust.

Implications for the Energy System

Although the study focuses on the carbon market rather than the power system itself, it reflects a key trend in energy transition finance: the value of climate assets is increasingly determined by their systemic added value, not just by a single unit of emissions reduction.

First, this will affect capital flows. When co-benefits become a pricing factor, project developers will be more inclined to design projects that combine carbon removal, agricultural improvement, soil management, or local development narratives. This could channel more funding into biomass utilization, agricultural carbon sinks, and land-based carbon removal-related assets.

Second, it will affect policy frameworks. If policymakers want to incorporate carbon removal into national climate strategies, they cannot focus only on permanence and additionality; they must also build a standardized verification system for co-benefits. Otherwise, the market will experience price distortions due to information asymmetry.

Third, it will affect market structure. The voluntary carbon market has long been questioned because of methodology, verification consistency, and double-counting issues. If co-benefits themselves become a source of price, then credit quality assessment will expand from “carbon” to a combined review of “carbon + SDG claims + impact evidence.”

From a systems perspective, this means the carbon market is evolving from a simple emissions offset tool into a more complex climate finance platform. What is being traded is not only emissions reduction outcomes, but also the credible packaging of sustainable development performance.

Challenges Ahead

This study also exposes several key challenges.

1. Co-benefit verification is difficult Compared with CO2 storage volume, co-benefits are often harder to quantify. For example, claims such as “supporting the local economy” or “improving soil health” can easily leave room for interpretation if there are no unified metrics.

2. The market may overreward narrative rather than results The study finds that co-benefits are associated with higher prices, but this does not automatically prove that the co-benefits are real, durable, and attributable. If buyers pay based only on claims rather than evidence, the market may reward marketing rather than performance.

3. The relationship between environmental claims and lower prices warrants caution In the study, more environmental claims were associated with lower prices. This does not necessarily mean environmental value is not appreciated; it may also reflect the market’s greater caution toward certain environmental claims, or the perception that they are more common and command a weaker marginal premium.4. The Voluntary Market Still Depends on Buyer Preferences Because the voluntary carbon market itself lacks mandatory demand, its prices are easily affected by corporate procurement preferences, reputation goals, and budget constraints. As a result, price signals for co-benefits may be highly fragmented.

5. “Co-benefit Greenwashing” Must Be Prevented One of the paper’s most important warnings is: if co-benefits are incorporated into the pricing system, then the truthfulness of these claims must be audited. Otherwise, the so-called sustainable development value may be nothing more than a label in transaction documents.

Future Outlook

Over the next 5 to 20 years, whether biochar and other novel carbon removal pathways can scale up will largely depend on two factors: whether the market continues to buy, and whether regulation gradually raises the credibility threshold.

From a trend perspective, as corporate net-zero target years draw nearer, demand for high-quality carbon removal may continue to grow. Mechanisms such as the Science Based Targets framework’s adoption of novel CDR credits will also continue to shape market structure. If more buyers in the future want to purchase “verifiable carbon removal + verifiable co-benefits,” then project development will look more like a form of integrated infrastructure investment rather than a simple carbon credit generation activity.

In the longer term, the carbon market may split into two categories:

• One is high-quality credits grounded in high-credibility verification, emphasizing permanence and proof of impact;
• The other is credits characterized by narrative packaging and low verification thresholds, with lower prices but weaker trust.

For policymakers and institutional buyers, the real question is no longer just “whether to buy carbon removal,” but “what kind of carbon removal to buy, how to prove its additional value, and how to avoid distorted market incentives.”

For the energy transition as a whole, this study provides a broader signal: future green capital allocation will not only look at emissions reductions, but also at whether projects can simultaneously deliver verifiable social, economic, and environmental value. If the carbon market is to become a long-term effective climate finance tool, it must move from “trading credits” to “trading credible outcomes.”

SEO Description

The study shows that the price of biochar carbon credits in the voluntary carbon market is influenced by sustainable development co-benefit claims. As demand for carbon removal rises, the market increasingly values the quality of carbon credits, auditing, and the truthfulness of SDG-related claims, which is highly relevant to carbon removal, the voluntary carbon market, and climate policy.

Source URL

https://www.nature.com/articles/s44458-026-00096-w