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As dawn crept over the Amazonian city of Belém on Saturday morning, representatives remained trapped in a windowless conference room, unaware whether it was day or night. They had been 12 hours in tense discussions, with numerous ministers representing various coalitions of countries including the least developed nations to the richest economies.

Frustration mounted, the air stifling as weary delegates faced up to the harsh reality: they were unlikely to achieve a comprehensive agreement in Brazil. The international climate negotiations faced the brink of complete breakdown.

The central impasse: Fossil fuels

Research has demonstrated for well over a century, the greenhouse gases produced by burning fossil fuels is heating up our planet to dangerous levels.

Yet, during over three decades of regular climate meetings, the crucial requirement to cease fossil fuel use has been mentioned only once – in a decision made two years ago at Cop28 to "transition away from fossil fuels". Delegates from the Middle Eastern nations, Russia, and a few other countries were resolved this would not be repeated.

Growing momentum for change

Meanwhile, a expanding group of countries were equally determined that advancement on this issue was crucially important. They had created a initiative that was gathering expanding support and made it evident they were ready to stand their ground.

Less wealthy nations urgently needed to move forward on securing financial assistance to help them manage the growing impacts of climate disasters.

Critical moment

During the night of Saturday, some delegates were willing to walk out and trigger failure. "It was on the edge for us," remarked one energy minister. "I was ready to walk away."

The pivotal moment happened through discussions with Saudi Arabia. Near 6am, principal delegates split from the main group to hold a private conversation with the head Saudi negotiator. They pressed wording that would subtly reference the global commitment to "move beyond fossil fuels" made two years earlier in Dubai.

Unanticipated resolution

As opposed to explicitly namechecking fossil fuels, the text would refer to "the Dubai agreement". After consideration, the Saudi delegation surprisingly approved the wording.

The room showed visible relief. Celebrations began. The settlement was completed.

With what became known as the "Belém political package", the world took another small step towards the gradual elimination of fossil fuels – a uncertain, inadequate step that will scarcely affect the climate's continued progression towards disaster. But nevertheless a important shift from absolute paralysis.

Key elements of the agreement

• Complementing the subtle acknowledgment in the formal agreement, countries will commence creating a roadmap to gradually eliminate fossil fuels
• This will be primarily a optional undertaking led by Brazil that will deliver findings next year
• Addressing the required reductions in greenhouse gas emissions to not exceed the 1.5C limit was also put off to next year
• Developing countries secured a tripling to $120bn of regular financial support to help them adapt to the impacts of extreme weather
• This sum will not be fully available until 2035
• Workers will benefit from a "fair adjustment program" to help people working in high-carbon industries transition to the clean economy

Varied responses

As the world teeters on the brink of climate "tipping points" that could eliminate habitats and throw whole regions into crisis, the agreement was far from the "significant advancement" needed.

"Negotiators delivered some modest progress in the right direction, but considering the scale of the climate crisis, it has not met the occasion," stated one environmental analyst.

This flawed deal might have been the best attainable, given the international tensions – including a Washington administration who ignored the talks and remains committed to oil and coal, the increasing presence of rightwing populism, continuing wars in various areas, unacceptable degrees of inequality, and global economic instability.

"The climate arsonists – the energy conglomerates – were finally in the focus at Cop30," comments one policy convener. "There is no turning back on that. The political space is open. Now we must turn it into a real fire escape to a protected environment."

Deep fissures revealed

Although nations were able to applaud the formal approval of the deal, Cop30 also revealed major disagreements in the sole international mechanism for confronting the climate crisis.

"UN negotiations are unanimity-required, and in a period of geopolitical divides, consensus is progressively challenging to reach," observed one international diplomat. "We should not suggest that Cop30 has delivered everything that is needed. The disparity between where we are and what science demands remains alarmingly large."

When the world is to avoid the most severe impacts of climate collapse, the UN climate talks alone will not be nearly enough.