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The leadership of climate talks, called COP28, sent out four pairs of veteran and high-level ministers to push countries together on four key but stubborn issues as the summit went into its second week after a day of rest Thursday.

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New proposed language on how to curb warming released Friday afternoon strengthened the options for a phase-out of fossil fuels that negotiators could choose from. Four of the five options call for some version of a rapid phase-out.

Major oil-producing nations were always seen as likely to resist that, and late Friday, multiple news organizations reported that OPEC's top official, Secretary-General Haitham Al Ghais, had written to member countries urging them to reject any text that targets fossil fuels rather than emissions. OPEC didn't immediately respond to an email from The Associated Press seeking comment.

Mohamed Adow, director of Power Shift Africa, called the letter "shameful."

"These letters show that fossil fuel interests are starting to realize that the writing is on the wall for dirty energy," Sadow said in a statement. "Their fossil fuels have imperiled the planet, pushed millions of people to the brink of survival and sadly, too many over that line. Climate change is killing poor people around the globe and these petrostates don't want COP28 to phase out fossil fuels because it will hurt their short-term profits."

Earlier, Adow had been among environmental advocates who had some qualified optimism about the expanded 27-page draft language.

"The bare bones of a historic agreement is there," Adow said. "What we now need is for countries to rally behind the stronger of the options and strengthen them further."

Making a possible final document stronger was also a priority for top United Nations officials.

"It's go time for governments at COP28 this week," U.N. Climate Chief Simon Stiell said at a press event. "If we want to save lives now and keep (the international goal of 1.5 degrees Celsius, 2.7 degrees Fahrenheit, of warming since pre-industrial times) within reach, the highest ambition COP outcomes must stay front and center in these negotiations."

Stiell underlined the challenge ahead if the world doesn't limit emissions, describing ice shelves melting to cause catastrophic flooding in coastal cities around the globe.

"If we pass these key thresholds, we can never go back from the planet's perspective," he said. A report released Wednesday on the sidelines of the summit warned that melting of ice sheets could reach the point of no return with more warming.

COP28 President Sultan al-Jaber said he was "quite positive, hopeful and optimistic" that the summit could bring a "paradigm shift centered around and based on the science."

Members of the four pairs of high level special teams -- who will work with negotiators from nearly 200 countries -- said they too thought they'd be able to get the job done.

"I think there is some momentum. Having spoken to all parties' groups of countries for months now there really is this sense of urgency," Denmark's Environment Minister Dan Jorgensen, told The Associated Press. "We need an agreement, so I am optimistic."

EU countries, some Latin American countries and the small island countries often victimized by climate change are aligned on calling for a phase-out of fossil fuels, negotiators said.

Two groups of countries are likely to oppose, in some manner, a full and quick phase out of fossil fuels, said World Resources Institute CEO Ani Dasgupta. One is developing nations, like India and Indonesia, that think they need fossil fuels to power up their economies, but with financial and other aid, they can be pulled out of that position, he said.

The other group are fossil fuel producers. The United States is the biggest oil producer in the world and Special Envoy John Kerry earlier this week said the U.S. is committed to supporting strong phase-out language. But a big country looming against it is Saudi Arabia and they are close partners with the United Arab Emirates, the country hosting and running the conference, Dasgupta said.

The UAE has a lot to gain from a successful climate conference and "I think they will bring Saudi Arabia as close as possible," Dasgupta said. When asked at a press conference about working with Saudi Arabia, al-Jaber, who also leads his country's national oil company, avoided answering that part of the question.

The Arab group is a major blocker so far, a negotiator said. The official spoke on condition of anonymity to avoid affecting negotiations.

"I felt from the consultations that very many parties understand that we have to have a real progress on mitigation," climate talk for emissions cuts, said Norway Foreign Minister Espen Barth-Eide. "That was not as true in Sharm el-Sheikh" in 2022 climate talks.

Annalena Baerbock, Germany's foreign minister, said: "What we need to be successful here is to achieve the goal of phasing out fossil fuels ... not emissions. It does make quite a substantial difference."

European negotiators provided some extra hope. The EU goal is to cut emissions by 55 per cent by 2030, but European Commissioner Wopke Hoekstra said Friday that the European parliament hopes to do better than than and instead slice 57 per cent.

Negotiators said there is a sense of urgency because of floods, droughts, storms and heat waves in a world that keeps setting heat records.

"We cannot negotiate with nature," Jorgensen said. "The climate cannot compromise."

As analysts and activists examined the new text they kept looking for more clarity, especially when it comes to fossil fuels and adaptation plans.

The frequent use of phase-out in the draft is good, "but it also has terms that would leave parties in an ambiguous position," said Jamal Srouji of World Resources Institute. He worried that it would not tell people clearly "who needs to do what when."

"We have never been closer to an agreement on a fossil fuel phase-out," said Oil Change International's Romain Ioualalen.

Asked when talks would start to go around the clock, Danish negotiator Jorgensen looked at his watch and said, "Now."

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Associated Press journalist Sibi Arasu and Gaurav Saini from The Press Trust of India contributed to this report.

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