The UN's carbon market finally issues its first credits. The hard questions start now.

The United Nations carbon market established under Article 6.4 of the Paris Agreement has cleared its first significant milestone, approving an initial set of credits through a cookstove project in Myanmar. For climate negotiators and carbon market advocates, this is the moment they have been waiting for since 2015. For critics, it is the moment they have been dreading for exactly the same length of time.

The project itself is modest in scope. Improved cookstoves reduce the amount of wood or charcoal burned by households, cutting both carbon emissions and the toxic indoor air pollution that kills an estimated 3.2 million people annually, according to the World Health Organization. On its face, it is the kind of intervention the carbon market was designed to reward: measurable, verifiable, and tied to genuine development co-benefits in one of the world's poorest countries. But the circumstances surrounding its approval reveal something more complicated than a clean policy win.

The concern that has shadowed this launch is not really about cookstoves. It is about what comes next, and specifically about the risk that older, lower-quality projects developed under the discredited Clean Development Mechanism, the Kyoto Protocol-era predecessor to Article 6.4, could be grandfathered into the new system. Campaigners and independent researchers have spent years documenting how CDM credits frequently failed to represent real emissions reductions, with some projects claiming credit for emissions that would never have occurred anyway, a problem known in the field as non-additionality.

The Paris Agreement's architects were aware of this history. Article 6.4 was supposed to represent a clean break, with tighter methodologies, independent oversight, and a supervisory body with genuine teeth. Whether those ambitions have survived contact with political reality is still an open question. The approval of credits through a legacy-adjacent project structure, before the full governance architecture is stress-tested, gives pause to those who remember how quickly the CDM's credibility collapsed once scrutiny arrived.

Myanmar adds a further layer of complexity. Since the military coup of February 2021, the country has been under international sanctions from multiple Western governments, and human rights organisations have raised serious concerns about whether development finance of any kind can be channelled into the country without indirectly supporting the junta's economic interests. The UN's own agencies have struggled to operate there. How the Article 6.4 supervisory body assessed these risks, and what safeguards were applied, has not been made fully transparent, which is itself a signal worth noting.

Zoom out from Myanmar and the deeper structural tension in carbon markets comes into focus. The projects that are easiest to register, verify, and credit tend to be the ones with the simplest emissions accounting: cookstoves, forestry, methane capture. The projects that are hardest to decarbonise, the steel mills, the cement plants, the long-haul shipping routes, are precisely the ones that generate the least attractive carbon credit economics. This creates a gravitational pull toward low-hanging fruit that can, paradoxically, allow high-emitting industries to purchase legitimacy without confronting their core business models.

The second-order consequence worth watching here is reputational contagion. The voluntary carbon market has already suffered a credibility crisis in recent years, with major investigations by journalists at The Guardian and researchers at Berkeley finding that a significant proportion of rainforest credits issued by leading certifiers like Verra did not represent real carbon reductions. Corporate buyers, burned by the headlines, have pulled back. If the Article 6.4 mechanism, which carries the explicit imprimatur of the United Nations, is seen to repeat those mistakes, the damage will not be contained to one project or one country. It will land on the entire architecture of market-based climate finance at precisely the moment when that architecture needs to be scaling up, not defending itself.

The UN's carbon market is not doomed. The supervisory body has real authority, and the methodological standards being developed are, on paper, more rigorous than anything the CDM produced. But standards on paper and standards in practice have a long history of diverging, especially when the financial incentives to approve credits are strong and the political will to reject them is weak.

The first credits have been issued. The first serious test of whether this system can hold its own integrity under pressure is still ahead.