A new draft agreement to avert the worst impacts of climate change is expected to be announced in the coming hours after talks at the COP26 summit in Scotland passed the Friday deadline.
Sticking points have included subsidies for coal and other fossil fuels, and financial help to poorer nations.
On Friday, envoys from small island nations threatened by rising sea levels said their land was fast disappearing.
The conference president, Alok Sharma, urged an injection of "can-do spirit".
Mr Sharma said he planned to release an amended draft deal at 08:00 GMT on Saturday based on consultations that continued late into the night.
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