Governments and climate leaders gather this month in Santa Marta, Colombia for the First Conference on Transitioning Away from Fossil Fuels. This landmark conference is happening as millions suffer from devastating and unlawful wars, and the global economy reels from oil price shocks. The task for those attending is clear: not to debate whether to phase out fossil fuels but to determine how to do it—rapidly, fairly, and in line with science and the law.Co-hosted by the governments of Colombia and the Netherlands (April 24–29), the Santa Marta conference will gather more than 50 countries from around the world to work on implementing a managed, financed, and equitable fossil fuel phaseout. That the gathering is happening is itself progress, particularly after decades of obstruction at the United Nations Framework Convention on Climate Change (UNFCCC), where a handful of countries have held climate action hostage and made fossil fuels taboo.

The enthusiasm the conference has generated—and the written submissions it has elicited on strategies to overcome economic dependence on oil, gas, and coal; transform supply and demand; and advance international cooperation and diplomacy—signals a turning point. The momentum for coordinated global action to move away from fossil fuels is unstoppable.

This conference could not come at a more crucial time, as the escalating climate crisis, mounting geopolitical turmoil, and violent conflicts deepen human suffering, upend economies, and lay bare why continued dependence on fossil fuels is a colossal vulnerability. It has never been more urgent to leave behind oil, gas, and coal than it is today.

Phasing out oil, gas, and coal is not just a scientific necessity and a legal obligation, it’s also an opportunity to break free from a destructive system.

The Center for International Environmental Law, along with other civil society organizations, Indigenous Peoples, and frontline communities, will be present in Santa Marta. We will push states to act in line with their existing legal obligations to phase out all fossil fuels—including by advancing a Fossil Fuel Treaty that can govern a just and rights-based transition.

The Duty to Phase Out Fossil Fuels

Less than a year ago, the International Court of Justice (ICJ) clarified that states have obligations under multiple sources of international law to prevent climate harm and protect the climate system. The court also affirmed that states have a duty to cooperate—effectively and in good faith—toward that end. Meeting these obligations requires coordinated action to address the primary driver of climate change: fossil fuels.

The implications are clear. States must cooperate to tackle the policies, norms, and practices that lock in fossil fuel production, facilitate expansion, delay phaseout, and sustain the fossil economy. This includes eliminating mechanisms like Investor-State Dispute Settlement (ISDS) that allow fossil fuel companies to demand compensation when governments take climate action, potentially making it prohibitive for countries to comply with their phaseout obligations. The law requires ending new fossil fuel licensing and public subsidies; halting the buildout of oil and gas—especially in the ocean; tackling petrochemicals used for products like plastics and ammonia; and rejecting dangerous distractions like carbon capture, offsets, and geoengineering, which only prolong the fossil fuel era and introduce new risks.

Why Santa Marta Must Advance a Pathway for a Fossil Fuel Treaty

A legally binding international agreement focused on fossil fuel supply—a Fossil Fuel Treaty—would provide a framework for countries to cooperate effectively on the phaseout of oil, gas, and coal, and manage the transition in a just and equitable way. In doing so, it would fill a governance gap on fossil fuels, while complementing and supporting existing multilateral processes under the UNFCCC and the Paris Agreement. These processes focus largely on climate action at the national level, including through nationally determined contributions (NDCs) for emissions reduction and adaptation, with support and finance based on historical responsibility and equity.The Santa Marta conference offers a critical opportunity to build support for the negotiation of a Fossil Fuel Treaty that facilitates reciprocal and collective state action toward a fossil-free future. A treaty would enable countries to align timelines, shape how phaseout unfolds, remove barriers to the transition, and reduce the costs while increasing the benefits of leaving oil, gas, and coal behind.

What a Credible Transition Requires

As States gather in Santa Marta,........

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