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While dawn crept over the Amazonian city of Belém on Saturday morning, representatives remained stuck in a enclosed conference room, oblivious whether it was day or night. Having spent 12 hours in strained discussions, with scores ministers representing various coalitions of countries ranging from the least developed nations to the richest economies.

Frustration mounted, the air thick as exhausted delegates acknowledged the grim reality: they would not reach a comprehensive agreement in Brazil. The latest global climate summit faced the brink of abject failure.

The major obstacle: Fossil fuels

Research has demonstrated for more than a century, the carbon dioxide produced by utilizing fossil fuels is increasing temperatures on our planet to dangerous levels.

Yet, during over three decades of regular climate meetings, the urgent need to cease fossil fuel use has been addressed only once – in a resolution made two years ago at Cop28 to "shift from fossil fuels". Delegates from the Middle Eastern nations, Russia, and several other countries were resolved this would not occur another time.

Increasing pressure for change

At the same time, a increasing coalition of countries were just as committed that progress on this issue was vitally needed. They had developed a initiative that was earning increasing support and made it clear they were ready to hold firm.

Developing countries urgently needed to move forward on securing financial assistance to help them manage the increasingly severe impacts of extreme weather.

Breaking point

During the night of Saturday, some delegates were prepared to walk out and trigger failure. "It was on the edge for us," commented one national delegate. "I was ready to walk away."

The pivotal moment occurred through negotiations with Saudi Arabia. Near 6am, principal delegates separated from the main group to hold a private conversation with the lead Saudi negotiator. They encouraged language that would obliquely recognise the global commitment to "transition away from fossil fuels" made two years earlier in Dubai.

Surprising consensus

Instead of explicitly namechecking fossil fuels, the text would refer to "the Dubai agreement". Upon deliberation, the Saudi delegation unexpectedly agreed to the wording.

The room collapsed into relief. Celebrations began. The agreement was finalized.

With what became known as the "Amazon accord", the world took another small step towards the phaseout of fossil fuels – a uncertain, limited step that will barely interrupt the climate's steady march towards catastrophe. But nevertheless a significant departure from absolute paralysis.

Key elements of the agreement

• Complementing the indirect reference in the official document, countries will begin work a plan to systematically reduce fossil fuels
• This will be mostly a optional undertaking led by Brazil that will deliver findings next year
• Addressing the required reductions in greenhouse gas emissions to remain below the 1.5C limit was likewise deferred to next year
• Developing countries achieved a threefold increase to $120bn of annual finance to help them adapt to the impacts of environmental crises
• This amount will not be fully available until 2035
• Workers will benefit from a "equitable change process" to help people working in polluting businesses shift to the sustainable sector

Varied responses

While our planet approaches the brink of climate "critical thresholds" that could devastate environments and throw whole regions into disorder, the agreement was insufficient as the "significant advancement" needed.

"Cop30 gave us some modest progress in the proper course, but in light of the scale of the climate crisis, it has failed to rise to the occasion," warned one policy director.

This flawed deal might have been the best attainable, given the political challenges – including a American leader who shunned the talks and remains aligned with oil and coal, the increasing presence of conservative movements, continuing wars in multiple regions, extreme measures of inequality, and global economic uncertainty.

"Fossil fuel corporations – the fossil fuel giants – were ultimately in the focus at the climate summit," comments one policy convener. "We have crossed a threshold on that. The political space is available. Now we must turn it into a actual pathway to a safer world."

Major disagreements revealed

Although nations were able to welcome the gavelling through of the deal, Cop30 also revealed significant divisions in the sole international mechanism for addressing the climate crisis.

"UN negotiations are consensus-based, and in a era of international tensions, unanimity is increasingly difficult to reach," commented one senior UN official. "It would be dishonest to claim that Cop30 has achieved complete success that is needed. The disparity between where we are and what research requires remains concerningly substantial."

Should the world is to prevent the most severe impacts of climate collapse, the international negotiations alone will prove insufficient.