Countries struggled to reach an agreement at the COP27 climate talks in Egypt, with some threatening to walk away if negotiators failed to make progress on fighting climate change.

With the talks already in overtime, officials from the 27-country European Union said on Saturday they were worried about a lack of progress overnight – and even the possibility of backsliding from parts of the COP26 climate deal agreed in Glasgow, Scotland, last year.

“We need to move forward, not backwards and all [EU] ministers … are prepared to walk away if we do not have a result that does justice to what the world is waiting for – namely that we do something about this climate crisis,” said EU climate policy chief Frans Timmermans.

Speaking to reporters on the sidelines of the summit, he called on other parties to the negotiations to reciprocate efforts to find a deal, particularly on the issue of funding for poorer countries hit by climate disasters.

“We believe that a positive result today is still within reach. But we are worried about some of the things we have seen and heard over the last, let’s say, 12 hours,” he said.

“We’d rather have no decision than a bad decision.”

‘Entirely unsatisfactory’

Sameh Shoukry, president of the COP27 climate summit, told the nearly 200 nations gathered in Egypt to “rise to the occasion” as the success of the conference hung in the balance.

Speaking a day after the summit was supposed to end, Shoukry added he knew there was a lot of “dissatisfaction” among all parties, but called on nations to show determination to reach a consensus.

New Zealand’s climate minister said a draft of the final document circulated by the presidency “has been received quite poorly by pretty much everybody”, adding delegations were going into another round of talks.

Speaking to reporters, James Shaw called the draft “entirely unsatisfactory”.

He added the proposal “abandons really any hope of achieving 1.5 [degrees Celsius; 2.7 degrees Fahrenheit]”, referring to the warming limit agreed at the Paris agreement back in 2015.

Shoukry said: “The issue now rests with the will of the parties. The [draft] text does keep the 1.5 alive.”

German Foreign Minister Annalena Baerbock said responsibility “now lies in the hands of the Egyptian COP presidency”.

The European Union had made clear overnight “we will not sign a paper here that diverges significantly from the 1.5C path, that would bury the goal of 1.5 degrees”, Baerbock said.

“If these climate conferences set us back then we wouldn’t have needed to travel here in the first place,” she said.

An official speaking on behalf of the African group of negotiators said they knew little about the negotiations.

“We keep hearing of nightlong side meetings to break the deadlock, but we have not been involved and we are waiting to see what it is they will come up with before we decide,” they said.