One senior negotiator, speaking on condition of anonymity, said the slow pace so far meant the second week of talks, being held in the Red Sea resort town of Sharm el-Sheikh, would be bogged down with too many unresolved agenda items.
That could also complicate the talks among government ministers on the so-called cover decisions - which make up the core political deal from the two-week summit.
“There's just a lot to get done in five days,” said Tom Evans, a policy analyst for the E3G non-profit think tank. “We haven’t seen huge solidarity between the developed and developing countries” but instead “disappointing commitments and action this year, which has dented trust.”