Delegates at U.N. climate talks worked into the early hours of Saturday to find common ground on a host of proposals, including a push by many nations to explicitly cite the cause of global warming: the burning of oil, gas and coal to power our world.

The annual talks are this year being held in Belem, a Brazilian city on the edge of the Amazon rainforest.

Talks were scheduled to wrap up on Friday, but negotiators flew past that deadline and it wasn't clear when they may finish.

Nations moved into high-level negotiations behind closed doors.

A key text among host Brazil's proposals deals with four difficult issues. They include financial aid for vulnerable countries hit hardest by climate change and getting countries to toughen up their national plans to reduce Earth-warming emissions.

Then there's the dispute over creating a detailed road map for the world to phase out the fossil fuels that are largely driving Earth's increasing extreme weather.

Any such plan would expand on a single sentence — to “transition away” from fossil fuels — agreed upon two years ago at the climate talks in Dubai.

But no timetable or process was spelled out and powerful oil-producing nations like Saudi Arabia and Russia oppose it.

More than 80 nations have called for stronger direction and Brazil President Luiz Inácio Lula da Silva also pushed for it earlier this month.

The Brazilian proposals — also called texts — came on the heels of a fire on Thursday that briefly spread through pavilions of the conference known as COP30 on the edge of the Amazon.

No one was seriously hurt but the fire meant that a day of work was largely lost.

On phasing out fossil fuels, the proposal “acknowledges that the global transition towards low greenhouse gas emissions and climate-resilient development is irreversible and the trend of the future.”

The text “also acknowledges that the Paris Agreement is working and resolves to go further and faster,” referring to the 2015 climate talks that established the goal to limit global warming to 1.5 degrees Celsius (2.7 degrees Fahrenheit), compared to the mid-1800s.

A key issue is that the 119 national emissions-curbing plans submitted this year don't come close to limiting warming to 1.5 degrees.

Though the text didn't address a fossil fuel transition road map, it could eventually end in a vaguely worded section about a plan for the next couple years in a separate road map.

The 36 nations who thought the text didn't go far enough included wealthy ones such as the United Kingdom, France and Germany along with smaller climate-vulnerable islands Palau, Marshall Islands and Vanuatu.

Agreements at these talks are officially reached when no nation objects and typically require many rounds of negotiations.

In practice, the proceedings can end with agreements adopted and the presidency adjourning the meeting after noting any objections.

Instead of the usual small group meetings, the Brazilian presidency convened a meeting of nations' top officials behind closed doors for much of Friday.

It’s designed to lessen any nation feeling left out of backroom deals, but it doesn’t let the public see countries’ objections.

AP video shot by: Teresa de Miguel

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