Paris climate talks: pressure mounts on countries to produce working text

France and UN want draft deal to be ready by weekend, but differences remain over details as negotiations reach half way point

Delegates from 195 countries at climate change talks in Paris are under pressure to produce a working text of a deal by Friday, exposing sticking points and fault lines nearly halfway through the UN negotiations.

Developed countries, along with the French hosts and the UN, were mostly optimistic about signing a deal in advance of the landmark summit.