"The conditions are in place to reach a broad and balanced package of decisions," she told delegates from almost 200 nations in the Mexican beach resort of Cancun.
"However, the positive outcome that our societies demand is still not complete."
The talks seek a package of measures including a new fund to channel aid to developing nations as well as ways to share clean technology, protect tropical forests that store carbon and help the poor adapt to the impact of climate change.
A treaty is out of reach after a 2009 summit in Copenhagen summit fell short of a legally binding deal to avert what U.N. climate experts say will be droughts, floods, heatwaves and rising sea levels caused by a build-up of greenhouse gases.
Espinosa said she had asked environment ministers for help. Britain and Brazil would try to resolve the deepest split, over the Kyoto Protocol, a pact that obliges nearly 40 developed nations to cut greenhouse gas emissions until 2012.
Japan, Russia and Canada have been adamant that they will not sign an extension and want a new, broader treaty that will also bind emerging economies led by China and India to act.
Cancun Climate Talks
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