The six-day round of talks that close on Friday had been tasked with streamlining a 37-page draft for the agreement that countries must sign in Paris in December.
That blueprint had emerged from a round of ministerial-level negotiations in Lima, Peru two months ago, and is replete with options on most key points, reflecting conflicting country interests and demands.
The text ballooned even further since Sunday until all countries were satisfied their views were represented -- to about 90 pages.
The talks in Switzerland, one of three sessions added to the 2015 UN climate calendar, must produce an official "negotiating text" by Friday to guide negotiations in the coming months.
The talks' co-chairmen had expressed the hope it would be a "streamlined" version of the Lima text, but this seems unlikely with only two days left for countries to agree on a mechanism for the streamlining process.
This was "a necessary part of ensuring that all parties feel ownership" of the eventual deal, said Ahmed Sareer, who represents the Alliance of Small Island States.
"No doubt we'll have our work cut out for us in the coming months," he added. "But I am confident we will meet our mandate for Geneva and stay on track toward an ambitious outcome in Paris."
The next step, said Clausen, is for negotiators "to find agreement on how to streamline the text as we move closer to the major talk in Paris at the end of the year.
