Among the unresolved issues is compensation for nations most affected by climate change.
A deal signed in Paris would come into being in 2020.
Participants at COP21 - as the UN conference is called - have been working on a draft text, prepared by the French presidency, since Wednesday.
This was seen as a significant moment after discussions that began in 2011 about a new global agreement that would stake out a long-term strategy for dealing with climate change.
The latest version draft document, delivered after consultations throughout Thursday, was 27 pages - considerably shorter than previous versions.
It says that temperature rises must be kept "well below 2C above pre-industrial levels and to pursue efforts to limit the temperature increase to 1.5C".