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As dawn was breaking the Amazonian city of Belém on Saturday morning, negotiators remained stuck in a airless conference room, oblivious whether it was day or night. For more than 12 hours in strained discussions, with numerous ministers representing 17 groups of countries from the least developed nations to the richest economies.

Tempers were short, the air thick as exhausted delegates confronted the grim reality: they would not reach a comprehensive agreement in Brazil. The 30th UN climate conference teetered on the brink of complete breakdown.

The sticking point: Fossil fuels

As science has told us for nearly a century, the CO2 emissions produced by burning fossil fuels is warming our planet to critical levels.

Yet, during more than three decades of yearly climate meetings, the crucial requirement to halt fossil fuel use has been addressed only once – in a agreement made two years ago at the Dubai climate summit to "transition away from fossil fuels". Officials from the Middle Eastern nations, Russia, and several other countries were resolved this would not be repeated.

Increasing pressure for change

At the same time, a growing number of countries were just as committed that advancement on this issue was vitally needed. They had developed a plan that was earning growing support and made it clear they were prepared to stand their ground.

Emerging economies strongly sought to advance on securing economic resources to help them address the growing impacts of environmental crises.

Critical moment

During the night of Saturday, some delegates were ready to withdraw and trigger failure. "It was on the edge for us," stated one government representative. "I was ready to walk away."

The critical development occurred through talks with Saudi Arabia. Shortly after 6am, key negotiators separated from the main group to hold a closed-door meeting with the head Saudi negotiator. They urged language that would indirectly acknowledge the global commitment to "move beyond fossil fuels" made two years earlier in Dubai.

Unexpected agreement

Instead of explicitly mentioning fossil fuels, the text would refer to "the previous commitment". After consideration, the Saudi delegation unexpectedly approved the wording.

Delegates collapsed into relief. Applause rang out. The settlement was completed.

With what became known as the "Amazon accord", the world took a modest advance towards the systematic reduction of fossil fuels – a uncertain, insufficient step that will scarcely affect the climate's ongoing trajectory towards disaster. But nevertheless a important shift from total inaction.

Key elements of the agreement

• In addition to the subtle acknowledgment in the legally agreed text, countries will commence creating a plan to phase out fossil fuels
• This will be primarily a non-binding program led by Brazil that will report back next year
• Addressing the essential decreases in greenhouse gas emissions to stay within the 1.5C limit was likewise deferred to next year
• Developing countries obtained a significant expansion to $120bn of yearly funding to help them manage the impacts of climate disasters
• This sum will not be fully available until 2035
• Workers will benefit from a "just transition mechanism" to help people working in high-carbon industries shift to the clean economy

Mixed reactions

While our planet teeters on the brink of climate "critical thresholds" that could destroy ecosystems and throw whole regions into chaos, the agreement was insufficient as the "significant advancement" needed.

"Cop30 gave us some modest progress in the right direction, but given the scale of the climate crisis, it has not met the occasion," cautioned one policy director.

This imperfect deal might have been the best attainable, given the international tensions – including a American leader who ignored the talks and remains aligned with oil and coal, the increasing presence of nationalist politics, continuing wars in different locations, unacceptable degrees of inequality, and global economic volatility.

"Fossil fuel corporations – the energy conglomerates – were ultimately in the spotlight at the climate summit," comments one policy convener. "We have crossed a threshold on that. The opportunity is accessible. Now we must transform it into a actual pathway to a protected environment."

Deep fissures revealed

Although nations were able to welcome the formal approval of the deal, Cop30 also exposed deep fissures in the primary worldwide framework for confronting the climate crisis.

"International summits are consensus-based, and in a era of geopolitical divides, consensus is ever harder to reach," observed one senior UN official. "We should not suggest that Cop30 has provided all that is needed. The gap between where we are and what science demands remains alarmingly large."

Should the world is to avert the gravest consequences of climate breakdown, the global discussions alone will fall far short.