After the arrival of ministers for the summit's final stretch, a new draft was released with more options on the most difficult part of an emerging deal: cutting fossil fuels to tame the planet's soaring temperatures.

The third version of the draft, which represents views of various countries, offers five options. One that remains from previous versions calls for not mentioning fossil fuels at all.

Other options include phasing out "unabated" fossil fuels, those whose emissions cannot be captured, with a goal of peaking consumption this decade and aiming for the world's energy sector to be "predominantly free of fossil fuels well ahead of 2050".

A new line calls for ramping up renewable energy to displace fossil fuels of oil, gas and coal, with a goal of "significantly reducing global reliance on non-renewable and high-emission energy sources".

That language is in line with an agreement between the United States and China, the world's top emitters of greenhouse gases, at talks in California last month.

COP28 president Sultan Al Jaber wants to wrap up the talks on schedule at 11 a.m. local time on Tuesday, which means that all the nearly 200 nations will have to come to a consensus.

"Let us please get this job done," he said.

Romain Ioualalen, global policy manager of the advocacy group Oil Change International, said that the latest text "shows we have never been closer to an agreement on a fossil fuel phaseout."

But he voiced alarm over "large loopholes" under consideration for the fossil fuel industry.

The most vocal holdout to calls to end fossil fuels is Saudi Arabia, which like summit host United Arab Emirates has grown wealthy on oil.

While China has sided with the camp opposed to a phase-out so far, the country is seen as a constructive partner in the talks, negotiators said.

"We won't reach a deal without China," said a French delegation official.

In a sign that oil-rich countries are growing worried, OPEC chief Haitham Al Ghais sent a letter to members of the cartel and their allies on Wednesday, urging them to "proactively reject" any COP28 deal that "targets" fossil fuels instead of emissions.

"It seems that the undue and disproportionate pressure against fossil fuels may reach a tipping point with irreversible consequences," Ghais wrote in the letter seen by AFP.

Climate campaigners have viewed Jaber with deep suspicion as he is head of the UAE national oil firm ADNOC.

But he has sought to reassure doubters by stating that a phase-down of fossil fuels is "inevitable".

Wopke Hoekstra, the European Union's climate commissioner, acknowledged that the fossil fuel question was the most difficult at COP28.

He voiced doubt about technologies promoted by energy producers, including the US, to rely on new technologies when extracting fossil fuels, so-called carbon capture and storage or CCS.

It is "crystal clear that CCS is part of the solution. But make no mistake: We cannot CCS ourselves out of this problem," Hoekstra said. The level of technology "simply doesn't exist. We need to drive down emissions."

Scientists warn that greenhouse gas emissions, the bulk of which come from burning fossil fuels, must fall by 43 percent by 2030 for the world to reach the goal of limiting warming to 1.5 degrees Celsius.

"I think many countries at the end might be able to agree to phase-out if the word unabated is included because unabated will weaken the phase-out and make it more of a phase-down," John Verdieck, director of international climate policy at The Nature Conservancy, told AFP.

This would still "create a good signal because the word phase-out could be in there", said Verdieck, a former climate negotiator at the US State Department.

Ugandan climate justice activist and UNICEF Goodwill Ambassador Vanessa Nakate said there were a record 2,400 fossil fuel lobbyists at the talks and the whole process was at stake.

"If after all of this, leaders still don't have the courage to agree upon a fossil fuel phase out, then it will put in question the credibility not only of COP28 but of the entire COP process," she said.

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