The talks in Dubai have highlighted deep international divisions over the future role of fossil fuels that are complicating efforts by nearly 200 countries to hash out an agreement before the summit's scheduled end on December 12.
"Now, the time has come for all parties to constructively engage," COP28 President Sultan al-Jaber told the conference on Sunday.
"Failure is not an option."
Activists have been protesting against fossil fuels at COP28 in Dubai. (AP PHOTO)
Al Jaber said he was asking all countries to suggest wording for a consensus on fossil fuels.
A coalition of more than 80 countries including the United States, the European Union and small island nations are pushing for an agreement at COP28 that includes language to "phase out" fossil fuels, the main source of greenhouse gas emissions that scientists blame for global warming.
They are coming up against tough opposition led by the oil producer group OPEC and its allies.
OPEC issued a letter to its members and backers on December 6 asking them to oppose any language targeting fossil fuels in a COP28 deal, and observers in the negotiations told Reuters some of those delegations appeared to be heeding the call.
"I think there are still quite entrenched positions," said Adam Guibourgé-Czetwertyński, Poland's Deputy Minister for Climate, who is heading the country's COP28 delegation.
"We are nearing the end, in terms of the time allocated for negotiations. But we are not quite there on the final outcome."
There is not much time left for COP28 delegates to agree the wording on the proposed phase out. (AP PHOTO)
OPEC's biggest producer and de facto leader Saudi Arabia, along with Russia and others, have argued that the focus of the COP28 should be on reducing emissions, not on targeting the fuel sources that cause them.
China's top climate envoy, Xie Zhenhua, said on Saturday that a COP28 deal can only be considered a success if it includes an agreement on fossil fuels – though he did not say whether Beijing would back a "phase out" deal.
"The positions on the issue are currently very antagonistic, and China is trying to find a solution that is acceptable to all parties and can solve the problems," he said, describing COP28 as the hardest climate summit of his career.
The latest version of the core negotiating text, released on Friday, shows countries were still considering a range of options - from agreeing to a "phase out of fossil fuels in line with best available science", to phasing out "unabated fossil fuels", to including no mention at all.
Three sources told Reuters that the COP28 presidency did not intend to release another draft until Monday, something that would leave negotiators just one full day to resolve differences ahead of the conference's scheduled end on Tuesday before noon.
The conference has yielded a slew of other commitments from countries to hit targets like tripling renewable energy and nuclear power deployments, slash coal use, and curb emissions of the powerful greenhouse gas methane.
Pledges on renewables, efficiency & methane at — Fatih Birol (@fbirol) #COP28 are positive steps, but brand new @IEA analysis shows the pledges bridge only 30% of the gap in 2030 toward reaching climate goalsAn "orderly & just decline of global fossil fuel use" is needed to keep 1.5C in reachMore ⬇️December 10, 2023
The International Energy Agency (IEA) said on Sunday that these pledges - if honoured - would lower global energy-related greenhouse gas emissions by four billion metric tonnes of carbon dioxide equivalent in 2030.
While the figure is substantial, it represents only about a third of the emissions gap that needs to be closed in the next six years to limit warming to 1.5C above pre-industrial levels, as agreed to in the 2015 Paris Agreement, the IEA said.
