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Copenhagen. Danish police fired pepper spray and beat protesters with batons outside the UN climate conference on Wednesday, as disputes inside left major issues unresolved just two days before world leaders hope to sign a historic agreement to fight global warming.

With the talks clearly deadlocked, Connie Hedegaard, the former Danish climate minister, resigned from the conference presidency to allow her boss, Danish Prime Minister Lars Loekke Rasmussen, to preside as world leaders from 115 nations streamed into Copenhagen. She was to continue overseeing the closed-door negotiations.

Hundreds of protesters were trying to disrupt the 193-nation conference, the latest action in days of demonstrations to demand “climate justice’’ — firm action to combat global warming. Police said 230 protesters were detained.

Inside the cavernous Bella Center convention hall, negotiators dealing with core issues debated until just before dawn without setting new goals for reducing greenhouse gas emissions or for financing poorer countries’ efforts to cope with coming climate change, key elements of any deal.

“I regret to report we have been unable to reach agreement,’’ John Ashe of Antigua, chairman of one negotiating group, reported to the conference on Wednesday morning.

In those overnight talks, the American delegation apparently objected to a proposed text it felt might bind the United States prematurely to reducing greenhouse gas emissions, before the US Congress acts on the required legislation. US envoys insisted, for example, on replacing the word “shall’’ with the conditional “should.’’

“A lot of things are in play,’’ said Fred Krupp of the US Environmental Defense Fund. “This is the normal rhythm of international negotiations.’’

Hundreds of protesters marched on the suburban Bella Center, where lines of Danish riot police waited in protective cordons. Some demonstrators said they wanted to take over the global conference and turn it into a “people’s assembly,’’ and as they approached police lines they were hit with pepper spray.

Television pictures showed a man being pushed from the roof of a police van and struck with a baton by an officer.

Tens of thousands rallied in the streets of the Danish capital last weekend, demonstrating growing public awareness of the worldwide danger of ever-rising temperatures. Scientists say global warming will lead to the extinction of plant and animal species, the flooding of coastal areas from rising seas, more extreme weather, more drought and diseases spreading more widely.

The Copenhagen talks so far have been marked by sharp disagreements between China and the United States, and between rich and poor nations. After nine days of largely unproductive talks, the lower-level delegates were handing off the disputes to environment ministers in the two-week conference’s critical second phase.

Organizers still hope to break deadlocks that threaten to leave the meeting with no major accomplishments to be presented to President Barack Obama, Chinese Prime Minister Wen Jiabao and more than 110 other world leaders arriving for Friday’s finale.

The lack of progress disheartened many, including small island states threatened by rising seas.

“We are extremely disappointed,’’ Ian Fry of the tiny Pacific nation of Tuvalu declared on the conference floor. “I have a feeling of dread, we are on the Titanic and sinking fast. It’s time to launch the lifeboats.’’

Much of the uncertainty in the Copenhagen talks stems from how slowly the first US legislation to cap carbon dioxide emissions is moving through Congress. Passage of a US climate change bill is expected no earlier than next spring — and many other nations are unwilling to make their final commitments until the US does.

The draft texts being debated behind closed doors hinge on four key issues, and negotiating views are generally divided between rich nations and developing ones.

Emissions

Industrialized nations are under pressure to cut back even more on emissions of carbon dioxide and other global-warming gases, while major developing countries such as China and India are being pressed to rein in their emissions growth. Environmentalists and poorer nations say richer countries should reduce their greenhouse gas emissions by 40 percent or more by 2020, compared with 1990 levels, to avoid serious climate damage. The European Union has pledged 20, possibly 30 percent. The United States has offered only a 3 percent to 4 percent cut.

Financing

Richer nations have discussed a “prompt start’’ package of $10 billion a year for three years to help developing nations adjust to the impact of global warming and switch to clean energy. Developing nations want to see commitments by wealthy nations for years more of long-term climate aid financing. Expert studies say hundreds of billions of dollars will be needed each year, and the developing nations are trying to establish stable revenue sources, such as a global aviation tax.

Monitoring

The United States and developed nations want some kind of international verification of emissions actions by developing nations. China, India and others are resisting what they consider potential intrusions on their sovereignty.

Legal form

For Europe, Japan and other developed nations, new, deeper emissions cuts will take the form of an extension of quotas under the 1997 Kyoto Protocol. The United States, which rejected Kyoto and wants to remain outside it, is likely to be included in a separate package that also deals with major developing countries. The level of legal obligation on each “track’’ may vary, particularly since the big developing countries — China and India — do not want to be bound by any international treaty to carry out their pledges of emission cuts. They prefer voluntary goals.



Associated Press