A bitter row over fossil fuels has broken out at the COP30 UN climate talks in Belém, Brazil, as the meeting formally runs over time.
At the heart of the row is a disagreement over how strong a deal should be on working to reduce the world's use of fossil fuels, whose emissions are by far the largest contributor to climate change.
The dispute pits groups of countries against each other, but all 194 parties must agree in order to pass a deal at the two-week summit.
Representatives and observers from inside a guarded negotiating room say the talks have become very difficult. One negotiator inside the room told the BBC that there is a lot of fighting.
The talks were meant to finish at 1800 local time (2100GMT) and will now spill into overtime. But the cruise ships that many delegations are staying on due to lack of accommodation in Belém depart the city on Saturday, piling on the pressure.
Brazil's President Luiz Inácio Lula da Silva and some countries including the UK want the summit to commit nations to stronger, faster action to reduce their use of fossil fuels. It would advance a deal made two years ago, at COP28 in Dubai, that committed countries to transition away from fossil fuels.
A first draft of an agreement in Brazil offered three options including timeframes, but the latest version has no mention of fossil fuels.
French Environment Minister Monique Barbut said the deal was being blocked by oil-producing countries - Russia, India, Saudi Arabia, but joined by many emerging countries. She added: As it stands now, we have nothing left. The BBC has approached Saudi Arabia for comment.
Speaking to journalists outside the negotiating room, Secretary of State for Energy Security and Net Zero Ed Miliband said the UK was determined to keep alive at the talks a plan to take further action on fossil fuels.
It's hard, it's sweaty, it's frustrating. There's a big divergence of views, he said.
We are determined that one way or another, this innovative idea, with the support of more than 80 countries to have a roadmap to transition away from fossil fuels, is kept alive at this COP, he said.
Mr. Miliband added: I think that in 10-20 years time people will say, 'You were the generation that saw the climate crisis around you. Did you take action? Did you rise to the challenge?' It's that sense of what will people think of us in the future that keeps me going.
Some developing countries have not backed the deal on fossil fuels because they want richer nations to first deliver on promises to give climate finance to help them cope with or adapt to the effects of climate change.
When asked if Pakistan would support the fossil fuel deal if it received new promises about finance, Aisha Moriana, head of Pakistan's delegation, replied: That is something which cannot happen in a few hours, and it requires a lot of financing.
In the hallways, groups of campaigners are chanting fossil fuels out and hanging banners saying Stop Amazon oil and 1.5C under threat: time to act.
The meeting is a fraught and delicate diplomatic process as countries jostle to protect their national interests while also attempting to address the issue of climate change. The complex talks have drawn criticism for their lengthy nature and frequent overruns.
However, others highlight significant advances in climate measures linked to COP agreements in recent years, includingrenewable energy initiatives and efforts to protect natural resources.
Deforestation remains another significant issue, particularly related to the Brazilian Amazon. The new draft deal has weakened previous language on this topic, leading to further discontent among advocacy groups.
As the negotiations continue amidst an atmosphere of tension and urgency, the eyes of the world remain on the outcomes and commitments that emerge from these critical discussions.
