Carbon Markets: How Carbon Credits Work
Master the Moment and Reach Your Peak with Defoes
“Defoes puts the EU’s hard‑cap carbon market and the softer, self‑policed voluntary market on the same page — showing how a shrinking EU ETS cap, expanding ETS2 and OECD ‘interplay’ rules are slowly forcing both systems into one transition price signal rather than two disconnected worlds.”
Carbon markets exist to put a price on greenhouse‑gas emissions and on the activities that reduce or remove them. At their core are carbon credits: tradable units that represent one tonne of CO₂‑equivalent avoided, reduced or removed relative to a defined baseline. The Defoes stance is bullish on carbon credits as a tool — not because they are perfect today, but because the architecture is maturing fast enough that credits are becoming analysable instruments rather than abstract “offsets.”
The basic mechanics: from project to credit
A carbon credit starts with a project that either cuts emissions or takes carbon out of the atmosphere. UNDP’s explainers list typical examples: protecting or restoring forests and wetlands, switching from coal or oil to renewables, capturing methane from landfills, or improving energy efficiency in buildings and industry. The project developer quantifies the impact against an agreed baseline — what emissions would have been without the project — and uses a recognised methodology under a crediting standard to calculate the tonnes reduced or removed.
Independent, third‑party verifiers then audit the project’s design and performance against that standard. If it passes, a registry issues one carbon credit for each verified tonne of CO₂‑equivalent, with a unique serial number so it can be tracked. Once a buyer uses a credit to “offset” their own emissions, the unit is retired in the registry so it cannot be resold or double‑counted. In principle, the chain from project → verification → issuance → retirement is what turns a local mitigation activity into a fungible instrument that governments, companies or individuals can use in meeting climate targets.
Compliance vs voluntary markets
There are two main types of carbon markets: compliance and voluntary.
Compliance markets are created by law or regulation. Governments cap emissions for certain sectors and either distribute or auction allowances, which firms can trade. In some systems, regulated entities can also use qualifying carbon credits from approved projects — often called “offsets” — to meet part of their obligations.
Voluntary carbon markets (VCMs) are marketplaces where companies, sub‑national governments and individuals buy credits to meet self‑imposed climate targets, such as “net‑zero by 2050,” rather than to satisfy a legal cap.
UNDP describes carbon markets as systems that allow governments and companies to meet emission‑reduction targets cost‑effectively by buying credits where mitigation is cheapest and retiring them against their own footprint. OECD analysis adds that voluntary and compliance markets increasingly interact: voluntary credits can, in some cases, be used in or influenced by compliance regimes, but that interplay raises integrity questions that regulators are now trying to address. For investors, the distinction matters because compliance demand is policy‑anchored and less discretionary, while voluntary demand is more sensitive to corporate climate strategies and reputational pressures.
Article 6 and the rise of high‑integrity credits
International rules are tightening around how cross‑border carbon trading should work. Article 6 of the Paris Agreement sets the framework for “cooperative approaches” between countries to achieve their national climate pledges (NDCs), including the use of internationally transferred mitigation outcomes. A World Bank explainer notes that Article 6 is meant to increase overall ambition, avoid double counting and support sustainable development, while allowing both public and private actors to participate. UNFCCC guidance emphasises that units used under Article 6 must be adjusted for in national greenhouse‑gas inventories to prevent the same reduction being claimed by both the host and the buyer country.
In parallel, the Integrity Council for the Voluntary Carbon Market (ICVCM) has launched the Core Carbon Principles (CCPs), a global benchmark for high‑integrity credits. The CCPs set thresholds across ten dimensions, including effective governance, robust tracking, transparency, independent verification, additionality, permanence, robust quantification, no double counting, sustainable‑development safeguards and contribution to the net‑zero transition. ICVCM assesses crediting programmes against these principles to determine whether their units can be labelled “CCP‑eligible,” with the goal of channelling finance towards credits that deliver real, verifiable climate impact. For Defoes’ readers, that means carbon credits are differentiating into tiers of quality, rather than remaining a single undifferentiated product.
A bullish but selective Defoes view
Defoes’ stance is that carbon credits are a useful, but not magical, part of the net‑zero toolbox. UNDP and the World Bank are clear that credits can lower the cost of meeting climate targets and unlock mitigation in places and sectors that would otherwise struggle to attract capital. OECD and ICVCM remind us that poorly designed markets can undermine environmental integrity, especially if credits are over‑issued, not truly additional, or double‑counted. The direction of travel in both compliance and voluntary systems is towards tighter rules, higher standards and more scrutiny — which should, over time, support higher prices and more stable demand for genuinely high‑quality credits.
For investors and corporates using Defoes’ lens, the bullish opportunity is not in treating credits as a cheap licence to continue emitting, but in understanding how carbon markets are evolving into more disciplined, rules‑based platforms that can finance real‑world decarbonisation. The practical questions are which standards and programmes will meet CCP‑level integrity, how Article 6 cooperation will shape cross‑border flows, and how fast voluntary demand will converge towards higher‑quality units. In that sense, “how carbon credits work” is no longer just a technical definition; it is a live market‑structure story that will influence both transition risk and opportunity over the coming decades.
Would it help if I now sketch a simple three‑row table (compliance, voluntary, Article 6 cooperative approaches) with “who participates, what the rules are, where credits fit” for you to drop under this explainer?