The 194-nation talks at the Caribbean resort city of Cancun were trying to finalize a general statement on the world's long-term action against climate change as envoys arrived for the main thrust of talks starting Tuesday.

But with few expecting a full-fledged climate treaty anytime soon, the UN-led negotiations were considering extending the Kyoto Protocol beyond 2012 -- setting off sharp disagreements.

The United Nations and host Mexico are mindful of widespread disappointment over last year's summit in Copenhagen and have tried to keep expectations in check by discouraging heads of state from coming and highlighting progress.

"We must continue working with a new sense of urgency," Mexican Foreign Minister Patricia Espinosa said. "I am optimistic that we will move forward very quickly in the next two days."

But the climate negotiator for the European Union, which champions action against global warming, said that advances during Cancun's first week of lower-level talks had been insufficient.

"Texts currently on the table are not ready to be used by ministers to finalize a deal," EU Climate Commissioner Connie Hedegaard said.

"A robust and balanced outcome is in reach here in Cancun, but it requires us to step up the pace of negotiations. We have come here to negotiate, not restate national positions."

Talks are taking place on two tracks. Organizers released a draft agreement on one of them -- the part covering long-term action by the world against global warming.

The draft would reconfirm a key part of the Copenhagen accord -- that the world needs to make "deep cuts" in industrial emissions to keep warming in check at two degrees Celsius above pre-industrial levels.

The draft also calls for a review on whether the goal should be strengthened to 1.5 degrees Celsius in light of warnings by scientists that the world faces growing natural disasters and extinction of species due to climate change.

The agreement would recommit developed countries to mobilize 100 billion dollars a year by 2020 to help the poorest nations adapt to climate change.

Wendel Trio, international climate policy director for environmental group Greenpeace, said that the atmophere in climate diplomacy had "vastly improved" in the past year but that Cancun "can still go both ways."

"We can leave with an agreement that has substance on a pathway to a legally binding deal, or have one with very little substance. It's hard to predict, but at least there's a positive sign," he said.

Momentum in several key developed nations has shifted away from climate action. The United States is unlikely to approve nationwide cuts on emissions anytime soon after the November election victory of the Republican Party, some of whose members doubt the scientific basis of climate change.

Faced with the growing view that a new global treaty is far away, the European Union has led calls to extend the Kyoto Protocol. Its requirements for developed nations to cut emissions run out at the end of 2012.

Japan has adamantly rejected the idea, saying that the Kyoto Protocol -- negotiated in its ancient capital in 1997 -- is unfair and that it will not sign up for a second round of pledges under the treaty.

The Kyoto Protocol makes no demands of developing nations such as China, which is now the world's top emitter. The United States, the number two emitter, also is free of requirements as it rejected the treaty in 2001.

"We must dispel the clouds over the Kyoto Protocol because we do not want to handicap the Cancun outcomes," said Indian negotiator Vijai Sharma.

India has joined China in balking at US-led demands that the next treaty legally bind them to cut emissions.

Sharma said that the issue was premature, saying: "Unless we know the substance, how can we speculate about the form?"

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