Countries were far from agreeing the contours of a climate deal at the COP27 summit in Egypt on Wednesday, with the host country urging negotiators to resolve their differences ahead of a weekend deadline.
The outcome of the conference in Sharm el-Sheikh is a test of world resolve to tackle global warming as other crises, ranging from Russia's war in Ukraine to consumer inflation, distract international attention.
Leaders from the G20 group of developed nations issued a declaration on Wednesday expressing support for a global goal to limit warming to 1.5 degrees Celsius, phase out coal and speed up climate finance.
And delegates at COP27 got a lift from a speech by Brazilian President-elect Luiz Inacio Lula da Silva, who vowed to re-engage the rainforest nation with international efforts to fight climate change.
But inside the negotiating rooms in Egypt, deep divisions remained, according to Egypt's COP27 presidency special representative Wael Aboulmagd.
"I think we have a larger than normal number of lingering issues," he said. "We would have hoped under the current circumstances to see more willingness to cooperate and accommodate than we are seeing."
An official close to the talks said divisions remained over issues including whether rich nations should set up a fund to cover irreparable damage being wrought by climate change, language addressing fossil fuels use and whether 1.5C should remain the explicit targeted limit for planetary warming.
"There is concern about how we're to get to the end, and there is concern because we're talking about the biggest problem facing humanity," the official said, asking not to be named.
US Special Climate Envoy John Kerry had said on Saturday that a few countries were resisting mention of the 1.5C goal in the official text of the COP27 summit, but did not name them.
Scientists say keeping average global temperature rise to 1.5C is needed to avert the worst effects of climate change. Temperatures have already increased by 1.1C.
A European Union official said the G20 support for 1.5C could increase the chances that negotiators in Egypt would also lock in the target. But the official warned "it's only safe when 1.5 is anchored in the cover decision," referring to what will form the core political deal from the summit.
BRAZIL IS BACK
Lula, speaking at an event alongside governors of Brazilian Amazon states, said: "I am here to say to all of you here that Brazil is back in the world." He also offered to host future UN climate talks.
Lula won the presidential election last month against right-wing President Jair Bolsonaro, who presided over mounting destruction of the Amazon rainforest and refused to hold the 2019 climate summit originally planned for Brazil.
This week's G20 talks in Bali also led to an agreement between the world's top two biggest greenhouse gas emitters, the United States and China, to resume climate cooperation after a hiatus triggered by diplomatic tensions over Taiwan.
And a coalition of countries also announced at G20 it would mobilise $20 billion of public and private finance to help Indonesia shut coal power plants, following a similar deal last year for South Africa.
The G20 declaration recognised the need to phase down use of unabated coal and phase out "inefficient" fossil fuel subsidies. It also said industrialised countries should make progress on climate finance - essentially restating goals made at previous summits.
India, the world's second-biggest buyer of coal, has said during the COP27 talks that it wants countries to agree to phase down all fossil fuels, rather than the narrower deal to phase down coal that was agreed at COP26 last year.
That proposal would benefit India, which has relatively small oil and gas reserves, by reducing the focus on its coal use, but has also drawn support from the European Union, which views the idea as a step up in ambition.
But it is a sore point for African and Middle Eastern countries keen to develop their oil and natural gas resources. Saudi Arabia has said it wants to avoid a deal that would "demonise" oil and gas.
Avinash Persaud, special envoy on climate finance to Prime Minister Mia Motley of Barbados, meanwhile, told Reuters the G20 declaration missed the mark on finance.
"Unfunded ambition gets us nowhere fast," Persaud said, adding he wanted G20 countries to unlock more lending from multilateral development banks they control to help climate-vulnerable countries.
"They have missed the opportunity to deliver on that today, and we are running out of time."