Series: Repricing Carbon — A Buyer’s Guide to the New Voluntary Market
- The Year Carbon Credits Stopped Being Free
- Inside a Carbon Credit: What “High Quality” Actually Means
- Ratings Aren’t New. Carbon Ratings Are.
- How a Carbon Buyer Thinks in 2026 (you are here)
- The Reform Loop
It is a Monday morning. A sustainability lead at a mid-sized company sits down with a two-million-dollar carbon credit budget for the year. Their board has approved the spend. Their CEO has signed off on the climate strategy. Their job, today, is to turn that budget into credits.
Three years ago, this was a small job. Pick a project type the company liked the sound of. Find a broker. Sign the contract. Move on.
Today, it is a different job entirely. The sustainability lead is no longer the only person in the room. Legal wants to see the diligence. Brand wants to know what story the credits tell. The CFO wants to understand the risk. The procurement team is reviewing the contract terms the way they would review any vendor agreement. The credits will eventually be retired, the retirement will be public, and any one of those teammates may have to defend the purchase if a journalist asks why the company bought what it bought.
The job is no longer procurement. It is risk management with a sustainability label on the door.
The new procurement stack
What does the work actually look like now? It runs through three filters, in order.
Filter one: ratings. Before the buyer evaluates any specific project, they narrow the universe. They pull ratings from one or more independent firms, sort by score, and discard credits that fall below a quality threshold the company has set in advance. This is the same move a bond portfolio manager makes when they say “we only buy investment grade.” It is a policy decision made once, applied many times.
This filter does most of the work. If the buyer’s threshold is “GHG integrity rating of B or higher, SDG impact rating of C or higher,” a significant share of available credits drops out before any deeper analysis begins. The buyer is not making a judgment about each project. The buyer is trusting the rating to have made the first judgment, and saving their attention for the credits that cleared.
Filter two: methodology and project fit. The credits that made it through the ratings filter still vary. Different project types, different geographies, different durations, different co-benefits. The buyer reads the methodology summary, looks at the project documentation, checks the developer’s track record, and asks whether the project fits the company’s specific climate strategy.
A consumer brand with a strong biodiversity commitment may favor projects with high SDG impact even if the GHG rating is slightly lower. An industrial company focused purely on carbon math may favor engineered removals with high permanence. A retailer with operations in a specific region may favor projects in that region for the brand story. The methodology filter is where company strategy meets credit selection.
Filter three: due diligence. For the credits the buyer actually intends to purchase, the diligence gets real. Site visit if the budget allows. Calls with the developer. Independent verification of the project’s most recent monitoring report. Review of any litigation, controversy, or community opposition associated with the project. This is the work that historically did not happen at all, and that now happens for every credit purchase above a meaningful threshold.
The three filters are sequential. The point is to apply the most attention to the smallest pool. Ratings narrow the universe. Methodology fit narrows it further. Diligence is reserved for the credits that actually get bought.
How a buyer defends a purchase
A defensible purchase, in 2026, is a purchase the buyer can explain to four different audiences using four different vocabularies.
To their general counsel, the buyer needs to explain why this credit, specifically, was a reasonable choice given the information available at the time. The rating is the anchor of that explanation. “We bought a B-rated credit because our policy allows credits at B or higher, and we documented the rating at the time of purchase.” This is the same shape of defense any procurement team makes for any vendor decision. The work was done. The record exists.
To their brand team, the buyer needs to explain why this credit tells a story the company is comfortable telling publicly. This is where the SDG impact rating, the project’s geography, and the developer’s reputation matter. A great GHG credit from a controversial developer is a brand risk. A solid GHG credit from a project with strong community benefits is a brand asset. The buyer’s job is to know which is which before the purchase, not after.
To their CFO, the buyer needs to explain why this credit was good value. Price relative to rating. Price relative to category benchmarks. The CFO does not need to understand additionality. The CFO needs to know that the price reflects quality and that the company is not overpaying for a credit that other buyers can get cheaper.
To their CEO, the buyer needs to summarize the entire decision in two sentences. “We bought one hundred thousand tons of high-integrity nature-based credits from projects in Southeast Asia. They are independently rated, they support our biodiversity commitment, and they fit our climate target.” The CEO is going to repeat that sentence on an earnings call or in a sustainability report. It has to be true, defensible, and short.
The buyer’s entire workflow is built backward from those four conversations. The credit selected has to satisfy all of them at once.
Portfolio thinking
Sophisticated buyers no longer purchase one credit type. They purchase a portfolio. The logic is the same as any other portfolio: blend assets with different risk and return characteristics to manage exposure.
A typical 2026 carbon portfolio might look like this. Forty percent in high-integrity nature-based credits with strong co-benefits, priced moderately, defensible on biodiversity and community grounds. Thirty percent in renewable energy credits in markets where additionality is still credible, priced low, used for volume. Twenty percent in engineered removals at a premium, used as the “permanent” anchor of the portfolio and the most defensible climate claim. Ten percent in newer, higher-risk project types that the company is willing to support but not depend on.
The blend changes by company. The pattern does not. The buyer is building a portfolio with a thesis, not collecting credits one at a time.
This is also how the ratings get used in the most sophisticated way. The buyer is not just asking “is this credit good?” They are asking “what role does this credit play in the portfolio, and is its rating consistent with the role I am asking it to play?” A B-rated credit can be fine in a portfolio if it is doing volume work. The same credit is a problem if it is supposed to be the headline asset in the sustainability report.
What the team looks like now
The carbon buyer in 2026 is not one person. It is a small group with a defined process. The sustainability lead runs the process. Legal reviews the diligence. Procurement handles the contracting. Finance signs the check. Brand reviews the story. The decision passes through all of them.
That team did not exist in 2020. It exists now because the cost of getting a credit purchase wrong has risen sharply, and because the tools to get it right have matured. Independent ratings are the most important of those tools. Without them, the team would have no anchor for the diligence. With them, the team has a starting point that is independent of the credit’s seller.
The role of the ratings firm, in this picture, is to compress the buyer’s first hundred hours of analysis into a published score that the buyer can apply at the policy level. The buyer is not outsourcing the decision. The buyer is buying the analytical floor on which the decision sits.
This is the change. The carbon market used to sell credits. It now sells defensibility. The credit is the asset. The defensibility is the product.
What this means for the market
When buyers think this way, project developers eventually have to respond. A project that cannot earn a defensible rating will struggle to find buyers above a small base of legacy customers. A project that consistently earns high ratings will see its credits trade at a premium. The market begins to reward integrity directly, rather than rewarding it indirectly through the press cycle.
This is the most important downstream effect of independent ratings, and it is the subject of the final piece in this series. Ratings are not just buyer protection. They are a pressure mechanism that changes what gets built, what gets approved, and what eventually gets sold. The reform loop that the carbon market has needed for a decade is being closed, not by regulation, but by buyers who have learned to ask better questions and rating firms that have learned to answer them.
That is Part 5.
A note from the author. I am a writer who cares about sustainability, and when it comes to carbon credits I am still very much a learner. There are a lot of people who know this market far better than I do, and I have real respect for the work they have put into building it. If I got something wrong in here, I apologize, and I would genuinely like to hear about it so I can learn and correct it. I am writing this to start a conversation, not to have the last word. That is the whole point. This is a learning experience for me too, and the conversation is what moves all of us forward. If this piece helped you, share it. If you see it differently, even better. Let’s talk.