Thirty Years After Rio, the Climate Regime Faces Its Final Test in Belém

Written by: Martin Waana-Ang

The road to the Belém climate summit was paved with the Amazon rainforest. In March, the BBC reported that trees were felled in Belém, the gateway to the Amazon, to build a road for COP30, the very summit devoted to protecting them (Ione Wells (BBC), ‘Amazon forest felled to build road for climate summit’ March 11, 2025) This moment, perhaps, captures more than any policy paper or communiqué, the uneasy soul of thirty years of the UN climate process, an enterprise forever caught between good intentions and quiet self-sabotage. The question is can anything truly redemptive emerge from Belém, when the path to climate salvation is already lined with the ruins of what we came to defend? 

Thirty years ago, governments met in Rio de Janeiro and made a simple promise: to prevent dangerous climate change. The UN Framework Convention on Climate Change (UNFCCC) was meant to anchor a new moral consensus and steady a warming world. Yet as leaders gather in Belém, that early optimism has curdled into irony. COP 30 is, therefore, the final test of the Paris Agreement—and of three decades of climate governance itself. The world arrives in Belém not to renew hope, but to see if hope can still survive. 

The climate regime has long lived a divided life. In diplomatic terms, the system has been remarkably successful. It survived the collapse of the Kyoto Protocol’s top-down model, delivered the Paris Agreement’s flexible architecture, and made every country on earth responsible for setting national climate commitments. It helped create the market signals that encouraged investment in renewable energy and low-carbon technologies. But, judged by the atmosphere’s response, the record is damning. When the Convention was signed in 1992, carbon dioxide levels wereas rising at roughly 0.7 parts per million per year. Today, the increase is over 3.7 ppm per year, more than five times faster. The physics is clear: emissions have not been curbed, and warming is accelerating. 

This is the paradox of the process: it is a political success that has completely failed to achieve its one and only goal—stabilizing the climate system. 

The Paris Agreement’s central genius was also its fatal flaw: it runs entirely on trust and peer pressure. It has no enforcement, no penalties. And that trust has been systematically destroyed by two key failures. 

The first trust-breaker is finance. In 2009, developed countries pledged to mobilize $100 billion annually by 2020 to support mitigation and adaptation in developing economies. The pledge has never been fully met. For many countries in the Global South, this shortfall is not a minor accounting error but a defining symbol of imbalance. Limited access to concessional finance constrains ambition, deepens vulnerability, and heightens political resentment. While governments agreed at COP29 in Baku to establish a new goal of at least $300 billion a year by 2035, with an aspiration to mobilize $1.3 trillion annually across public and private channels, the credibility gap remains large. Belém’s presidency has postponed difficult discussions, but postponement does not substitute for confidence. 

The second trust-breaker is American inconsistency. The revolving door of US engagement, in, out, back in, and now, out again under the second Trump administration—has made the world’s largest economy and pre-eminent power a profoundly unreliable partner. This isn’t just a political headache; it's a global tragedy that guts climate finance, erodes diplomatic trust, and allows other major emitters to dodge ambition. This is the broken, cynical, and mistrustful system that arrives in Belém. 

What makes COP30 the final exam is that it is the deadline for two things that cannot be postponed.  

First, countries must submit new Nationally Determined Contributions (NDCs) for 2035 in response to the Global Stocktake completed at COP28. The sStocktake confirmed that the world is on course for roughly 3°C of warming—double the Paris aspiration. The UN estimates that global emissions must fall by 60% by 2035 to retain a viable 1.5°C pathway. Current pledges offer reductions of only around 10%. Belém represents the first real opportunity to test the Paris Agreement’s ratchet mechanism: whether countries respond to a failing grade by raising ambition or by lowering expectations. 

Second, states must agree on a new collective finance goal to replace the broken $100 billion pledge. The sums under discussion, approaching trillions annually, reflect the scale of investment required. Developing economies need nearly $6 trillion for mitigation and adaptation by 2030(UNFCCC Standing Committee on Finance First report on the determination of the needs of developing country Parties related to implementing the Convention and the Paris Agreement). Without a credible financial foundation, ambitious NDCs will remain politically unattainable for many countries. 

But one might ask, what if, instead of trying to pass this exam with the same failed study habits, we adopted three new, heretical rules? The 30-year diagnosis shows us the cure. 

First, climate finance must shift from a voluntary pledge-and-review model to a predictable, rules-based system. Modest levies on fossil-fuel extraction, international shipping, or aviation—sectors often exempt from national accounting—could generate reliable revenue for adaptation and loss and damage. Such mechanisms would reduce dependence on donor discretion and insulate climate finance from domestic political cycles. 

Second, the Paris Agreement’s ratchet mechanism needs meaningful enforcement. Diplomatic exhortation has not delivered the needed ambition. Imagine if the U.S. and E.U. had previously imposed strict tariffs on high-carbon emitters; that action would have fundamentally forced countries to rethink their emissions policies. This must become the new standard. A Climate Club of ambitious economies must agree that failure to submit a 1.5°C-aligned 2035 NDC will trigger steep, unified carbon border tariffs.  

Third, break the consensus veto. The UNFCCC should cease seeking universal agreement on every detail and instead formally recognize binding plurilateral deals on issues like coal phase-out. This empowers the ambitious and isolates the obstructors, ensuring the speed of the transition is set by the committed, not the captured. 

For 30 years, the UNFCCC has been a process in motion while the planet remained in peril—a paradox now carved into the Amazon floor. Belém will force a verdict. We will finally learn if the Paris Agreement is a binding framework for survival or the most sophisticated, consensus-based delay tactic ever created.