PARIS (AP) — The latest news from the U.N. climate conference that began Monday in Paris. All times local:

10:45 a.m.

The European Union's environment agency says air pollution remains the single largest environmental health risk in Europe, causing more than 430,000 premature deaths in 2012.

The agency says the data, based on monitoring points across Europe, shows that people living in cities are still exposed to air pollution of "levels deemed unsafe by the World Health Organization" and resulting in serious illnesses, including heart disease, respiratory problems and cancer.

Hans Bruyninckx, head of the Copenhagen-based European Environment Agency said that air pollution also has "considerable economic impacts" by increasing medical costs and reducing productivity through lost working days.

The annual air quality report was released Monday as the U.N. climate conference opened in Paris, which aims to create a landmark agreement to fight global warming.

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10:10 a.m.

High-level climate talks have begun in Paris with the goal of a long-term deal to reduce man-made emissions.

Peruvian Environment Minister Manuel Pulgar Vidal, who played host to the last U.N. climate conference in Lima, declared this year's meeting open Monday morning.

A total of 151 world leaders have converged on Paris to launch the two-week talks in hopes of giving an impetus for an ambitious agreement.

Vidal said a deal would show the world that countries can work together to fight global warming as well as terrorism. The talks are occurring just two weeks after deadly attacks in Paris by Islamic State extremists.

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10:05 a.m.

President Barack Obama says nowhere has coordination between the United States and China been more fruitful or critical than on climate change.

Obama says 180 nations followed the lead of the U.S. and China on climate change. He says "our leadership on this issue has been absolutely vital."

Obama is meeting with Chinese President Xi Jinping on the sidelines of the climate conference.

Xi says climate change is a huge challenge. He's calling for the U.S. and China to build a new model of cooperation, using diplomatic language long preferred by Beijing.

China emits about 30 percent of the world's greenhouse gases and the U.S. about 16 percent.

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9:20 a.m.

Paris police say 317 people were detained after an unauthorized protest seeking to call attention to climate change, which ended with police firing tear gas at protesters throwing bottles and candles.

The Paris police department had said Sunday night that 174 were detained in the protest, then said Monday morning that the figure had grown to 317. It did not give a reason for the growing number.

France is under a state of emergency after Nov. 13 attacks that killed 130 people. It banned protests ahead of landmark climate talks opening Monday, citing security concerns.

But thousands of people formed a human chain along the route of a long-planned environmental march Sunday. It was largely peaceful.

President Francois Hollande denounced the violence as "scandalous."

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8:20 a.m.

U.N. Secretary General Ban Ki-moon and French President Francois Hollande are greeting heads of state and government from around the world for high-stakes talks aimed at fighting global warming.

One by one, some 150 leaders are arriving at the conference center near the Le Bourget airfield just north of Paris. Ban, Hollande, the head of the U.N. climate change agency Christina Figueres, and French Environment Minister Segolene Royal are standing in front of the conference center to greet them.

Afterwards, each leader will give a speech laying out their countries' efforts to reduce man-made emissions and cope with climate change.

The event opening Monday lasts through Dec. 11 and is under extra-security after Nov. 13 extremist attacks in Paris.

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7:30 a.m.

Wide Paris-area highways usually packed with commuters are cordoned off to clear the way for President Barack Obama and 150 other world leaders joining critical talks about fighting global warming.

Riot police vans and plainclothes officers are stationed around the capital and the northern suburb of Le Bourget, where the U.N.-led climate conference is being held Nov. 30-Dec. 11.

The security measures are especially tight after Islamic extremists killed 130 people two weeks ago in Paris and targeted the national stadium Stade de France, near the climate conference venue.

U.N. Secretary-General Ban Ki-moon and French President Francois Hollande will greet each of the leaders Monday morning then each will give a speech about what their countries are doing to reduce emissions and slow climate change.