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As dawn illuminated the Amazonian city of Belém on Saturday morning, delegates remained stuck in a windowless conference room, oblivious whether it was day or night. They had been 12 hours in strained discussions, with numerous ministers representing various coalitions of countries from the most vulnerable nations to the most developed economies.

Tempers were short, the air heavy as sweaty delegates acknowledged the grim reality: they would not reach a comprehensive agreement in Brazil. The latest global climate summit faced the brink of total collapse.

The central impasse: Fossil fuels

Research has demonstrated for more than a century, the CO2 emissions produced by consuming fossil fuels is heating up our planet to alarming levels.

Yet, during nearly three decades of yearly climate meetings, the essential necessity to cease fossil fuel use has been addressed only once – in a agreement made two years ago at Cop28 to "move beyond fossil fuels". Delegates from the Middle Eastern nations, Russia, and several other countries were adamant this would not be repeated.

Growing momentum for change

Simultaneously, a expanding group of countries were similarly resolved that progress on this issue was urgently necessary. They had developed a plan that was attracting growing support and made it evident they were ready to hold firm.

Less wealthy nations desperately wanted to make progress on securing economic resources to help them cope with the growing impacts of environmental crises.

Critical moment

By the early hours of Saturday, some delegates were ready to withdraw and force a collapse. "We were close for us," remarked one national delegate. "I was ready to walk away."

The pivotal moment came through negotiations with Saudi Arabia. Near 6am, key negotiators left the main group to hold a confidential discussion with the chief Saudi negotiator. They encouraged text that would obliquely recognise the global commitment to "move beyond fossil fuels" made two years earlier in Dubai.

Unexpected agreement

As opposed to explicitly referencing fossil fuels, the text would refer to "the Dubai agreement". Upon deliberation, the Saudi delegation surprisingly agreed to the wording.

Participants collapsed into relief. Applause rang out. The settlement was finalized.

With what became known as the "Belém political package", the world took a modest advance towards the systematic reduction of fossil fuels – a uncertain, inadequate step that will minimally impact the climate's continued progression towards catastrophe. But nevertheless a important shift from complete stagnation.

Key elements of the agreement

• In addition to the subtle acknowledgment in the legally agreed text, countries will commence creating a roadmap to phase out fossil fuels
• This will be mostly a optional undertaking led by Brazil that will report back next year
• Addressing the essential decreases in greenhouse gas emissions to remain below the 1.5C limit was also put off to next year
• Developing countries obtained a tripling to $120bn of regular financial support to help them cope with the impacts of environmental crises
• This amount will not be fully available until 2035
• Workers will benefit from a "fair adjustment program" to help people working in polluting businesses transition to the renewable industry

Varied responses

With global conditions hovers near the brink of climate "irreversible changes" that could eliminate habitats and force whole regions into chaos, the agreement was insufficient as the "giant leap" needed.

"Negotiators delivered some modest progress in the right direction, but considering the magnitude of the climate crisis, it has fallen short of the occasion," warned one climate expert.

This imperfect deal might have been the maximum achievable, given the political challenges – including a Washington administration who shunned the talks and remains wedded to oil and coal, the growing influence of conservative movements, persistent fighting in multiple regions, extreme measures of inequality, and global economic instability.

"The climate arsonists – the fossil fuel giants – were finally in the spotlight at Cop30," comments one climate activist. "This represents progress on that. The platform is accessible. Now we must transform it into a genuine solution to a more secure planet."

Deep fissures revealed

While nations were able to applaud the formal approval of the deal, Cop30 also exposed major disagreements in the primary worldwide framework for addressing the climate crisis.

"UN negotiations are agreement-dependent, and in a time of global disagreements, unanimity is progressively challenging to reach," observed one senior UN official. "I cannot pretend that these talks has provided all that is needed. The gap between our current position and what science demands remains dangerously wide."

If the world is to avert the most severe impacts of climate crisis, the international negotiations alone will prove insufficient.