There is frustration that countries are focussing on trying to get advantages in the talks, instead of working together to increase 
ambition.

"The Paris agreement is clear: all countries agreed to deliver new climate targets by 2020, and as the recent UNEP emissions 
gap report made clear, the onus is on the top 10 polluters to deliver," said Laurence Tubiana, one of the key architects of the 
Paris agreement, now with the European Climate Foundation.

"I know leaders in Brussels, Delhi, Beijing, Tokyo and Ottawa care about global action, but we need them to deliver this week. 
We need their leadership to deliver on their Paris commitments."

As well as the pre-2020 question, the talks are stuck on two tricky, technical issues - one about the question of loss and 
damage, the other about carbon markets.