A plain-English explainer from the Repricing Carbon series. If you are brand new, start with What Is a Carbon Credit? first.
Here is a question that trips up almost every new carbon buyer. A credit comes stamped by a big, official-sounding registry. So it must be good, right? Not exactly. Understanding why is the single most useful thing a buyer can learn, and it takes about five minutes.
What a registry actually is
A registry is the organization that runs the plumbing of the carbon market. The largest ones have names you will see everywhere: Verra, Gold Standard, and a few others. When a project wants to sell carbon credits, the registry is who it goes through.
A registry does three real jobs.
Approves the method
It signs off on the recipe a project uses to calculate how much carbon it saved, called a methodology.
Issues the credits
Once a project is verified against that method, the registry creates the actual credits the project can sell.
Keeps the ledger
It tracks who owns each credit and marks it as used once it is claimed, so the same ton cannot be sold twice.
That is genuinely important work. Without a registry there is no market at all. But notice what is missing from that list.
What a registry does not do
A registry does not promise that any single credit is good.
It confirms that a project followed an approved method. It does not judge how well the project actually performed against that method. It does not check whether the project overstated how much carbon it was really saving. It does not decide whether a forest was ever truly at risk of being cut down. Those judgments were never the registry’s job. They were never designed to be.
A registry tells you the project followed the rules. It does not tell you whether following those rules produced a real climate result.
A way to picture it
Think of a registry like the agency that grants a driver’s license. To get one, you pass a test and follow a set process. The license proves you cleared the bar. It does not promise you are a careful driver every day after that. Some licensed drivers are excellent. Some are not. The license and the daily driving are two different things.
Carbon credits work the same way. The registry stamp is the license. Whether the project drives well, year after year, is a separate question. And for a long time, almost nobody was checking.
Why this gap caused real problems
For years, buyers treated the registry stamp as the whole guarantee. If Verra or Gold Standard issued a credit, it was treated as sound. Then, in January 2023, a major journalistic investigation reported that a large share of certain rainforest credits likely did not represent real emission cuts, even though they carried a valid stamp. The methodology debate that followed is genuine and still ongoing. But the lesson for buyers was simple and permanent. The stamp was never a promise of quality. It was a starting point.
So how does a buyer tell a good credit from a weak one?
This is exactly the gap that independent carbon ratings fill. A rating firm does the job the registry was never built to do: it judges the specific project, not just the method behind it. A company like Calyx Global grades credits from the buyer’s side, so a buyer can see which ones are strong before spending a dollar. It is the equivalent of a second opinion that looks past the license and at the actual driving record.
That is the layer the rest of this series is about. The stamp gets a project into the market. The rating tells you whether the credit is worth your money.
Where to go next
That is the core idea: a registry makes the market possible, but it does not promise that any one credit is good. If you want the fuller story of how buyers learned this the hard way, Part 1 of the series walks through the 2023 turning point in depth. If you would rather learn what actually separates a strong credit from a weak one, that is the five quality questions.
Carbon Credit 101 · Step 2 of 5
← What is a carbon credit? · Next: The five quality questions →
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.
