Talks to reach a climate deal at a United Nations summit in Glasgow will continue into Saturday afternoon, after a Friday deadline passed without an agreement.

COP26 president Alok Sharma has told delegates that revised documents for the agreements to be struck at the conference will be issued overnight, and be available by 8am on Saturday.

A short plenary meeting is to be held on Saturday morning, when Mr Sharma will introduce the documents, share his assessment of the state of the negotiations and set out proposed next steps.

Will they reach a deal? Crucial COP talks enter final stretch – follow live

He said he envisages a formal plenary in the afternoon to adopt the final decisions of COP26 and close the session on Saturday.

The original deadline for clinching a deal had been 6pm on Friday.

The UK presidency is desperately trying to bring consensus among the almost 200 nations involved before final agreements can be published.

Prime Minister Boris Johnson still believes “an ambitious outcome is in sight”, despite language around fossil fuels emerging as one of the talks’ sticking points.

In a readout of Mr Johnson’s call with Canadian Prime Minister Justin Trudeau on Friday evening, a Downing Street spokeswoman said: “They discussed progress in the ongoing Cop26 negotiations in Glasgow and agreed that an ambitious outcome is in sight…

“The leaders committed to work together to help resolve outstanding issues in the talks and reach an agreement at Cop26 that works for all countries.”

While visiting a vaccination centre in Sidcup, south-east London earlier, the prime minister reiterated that the UK, as hosts of Cop26, were moving “heaven and earth” to get everyone to see the vital importance of agreement at the talks – to keep the prospect of limiting warming to 1.5C alive.

In the Paris Agreement in 2015, countries committed to limit temperature rises to “well below” 2C and try to limit them to 1.5C to avoid the most dangerous impacts of storms, droughts, crop failures, floods and disease.

Scientists have warned that keeping temperature rises to 1.5C requires global emissions to be cut by 45% by 2030, and to zero overall by mid-century.

But despite countries being required to update their action plans, known as nationally determined contributions, for emissions cuts up to 2030 in the run-up to Glasgow, the latest pledges leave the world well off track to meet the goal.

A call in the first agreement draft to “accelerate the phase-out of coal and subsidies for fossil fuels” – key to keeping 1.5C alive – survived a battering in the negotiations, though came out weakened, after facing resistance from fossil fuel majors like Saudi Arabia and Russia.

The second draft, published Friday morning, calls upon parties to phase-out of “unabated” coal power and “inefficient” fossil fuel subsides.

Saudi Arabia appears to be pushing hard to remove any trace of fossil fuels in the COP26 text.

Senior Saudi Arabia negotiator Ayman Shasly told Sky’s climate change correspondent Hannah Thomas-Peter that the Paris agreement must be protected and reflected by Glasgow.

He said anything else is “unacceptable”. The Paris agreement does not contain references to fossil fuel.

Meanwhile, China and Saudi Arabia have resisted proposals for countries to ratchet up their climate action plans – known as NDCs – for the period to 2030 by the end of next year.

Although, the new version of the agreement “requests” countries to revisit and strengthen their plans for 2030 within the next year in line with the Paris temperature goal – seen as stronger language than the first draft which “urges” countries to do so.

Meanwhile, many developing countries called for more finance for poorer nations to develop clean energy and adapt to the changing climate.

The new draft includes a date of 2025 for developed countries to double the share of finance that is going to these nations.

As climate envoys aired their views on the latest draft, the EU’s Frans Timmermans said “without these concrete steps our targets will be meaningless”. John Kerry, representing the United States, said: “to feed the very problem we are here to try to cure… that’s a definition of insanity”.

However, neither called for the language to revert to its original, stronger form and the references may yet be watered down further in the final version.

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