UN climate talks appear to be in trouble as they head into extra time.

Axar.az reports citing foreign media.

Fault lines have re-appeared between different negotiating blocs, with one delegate describing a new draft text as "totally unacceptable".

Alden Meyer, from the Union of Concerned Scientists said the situation in Madrid was unprecedented since climate negotiations began in 1991.

Negotiators are working towards a deal for countries to commit to new carbon emission cuts by the end of 2020.

Saturday saw the release of a new draft text from the meeting, designed to chart a way forward for the parties to the Paris agreement.

The Paris pact came into being in 2015, with the intention of keeping the global average temperature to well below 2C. This was regarded at the time as the threshold for dangerous global warming, though scientists subsequently shifted the definition of the "safe" limit to a rise of 1.5C above pre-industrial levels.