MADRID — Marathon U.N. climate talks ended Sunday with a slim compromise that sparked widespread disappointment, after major polluters resisted calls for ramping up efforts to keep global warming at bay and negotiators postponed debate about rules for international carbon markets for another year.

Organizers kept delegates from almost 200 nations in Madrid far beyond Friday’s scheduled close of the two-week talks. In the end, negotiators endorsed a general call for greater efforts to tackle climate change and several measures to help poor countries respond and adapt to its impacts.

U.N. Secretary-General António Guterres said he was “disappointed” by the meeting’s outcome.

“The international community lost an important opportunity to show increased ambition on mitigation, adaptation and finance to tackle the climate crisis,” he said. “We must not give up and I will not give up.”

The final declaration cited an “urgent need” to cut planet-heating greenhouse gases in line with the goals of the landmark 2015 Paris climate change accord. But it fell far short of explicitly demanding that countries submit bolder emissions proposals next year, which developing countries and environmentalists had demanded.

The Paris accord established a common goal of keeping temperature increases below 3.6 Fahrenheit, ideally 2.7 degrees Fahrenheit by the end of the century. So far, the world is on course for a rise, with potentially dramatic consequences for many countries, including rising sea levels and fiercer storms.

After two nights of fractious negotiations, delegates in Madrid decided to defer some of the thorniest issues to the next U.N. climate summit in Glasgow in November.

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COP25 President Carolina Schmidt listens a speech from a party member during the closing plenary in Madrid on Sunday. Schmidt said she was “sad” a deal wasn’t reached and that “we were on the verge.”  Bernat Armangue/Associated Press

Chile’s Environment Minister Carolina Schmidt, who chaired the meeting, said she was “sad” no deal had been reached on the rules for international trading in carbon emissions permits.

“We were on the verge,” she said, adding that the goal was to establish markets that are “robust and environmentally sustainable.”

Economists say putting a price on carbon dioxide, the main greenhouse gas, and allowing countries or companies to trade emissions permits, will encourage the shift to away from fossil fuels toward renewable energy.

Some observers welcomed the failure of a deal on carbon markets, though, and the European Union and developing countries had said beforehand that no deal was better than a bad one.

“Thankfully, the weak rules on a market-based mechanism, promoted by Brazil and Australia, that would have undermined efforts to reduce emissions, have been shelved,” said Mohamed Adow, director of Nairobi-based campaign group Power Shift Africa.

Helen Mountford, from the environmental think-tank World Resources Institute, said that “given the high risks of loopholes discussed in Madrid, it was better to delay than accept rules that would have compromised the integrity of the Paris Agreement.”

The talks in Spain took place against a backdrop of growing worldwide concern about climate change. The past year saw large protests in hundreds of cities around the globe and climate activists staged several rallies inside and outside the conference venue to express their frustration at the slow pace of the talks.

Delegates made some progress on financial aid for poor countries affected by climate change, despite strong resistance from the United States to any clause holding big polluters liable for the damage caused by their emissions. Countries agreed four years ago to funnel $100 billion per year by 2020 to assist developing nations, but so far nowhere near that amount has been raised.

Under the Paris accord, countries are supposed to regularly review their national emissions reduction targets and increase them if necessary. Last week, the European Union agreed a goal of becoming carbon neutral by mid-century, but the move did little to sway discussions in Madrid about setting more ambitious targets in the medium term, an issue that will be on the agenda again in Glasgow.

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