Janos Pasztor, the UN assistant secretary-general for climate change, told a news conference yesterday that preparations and some activities are affected, including a huge march on November 29 by supporters of an agreement to reduce carbon emissions that has been cancelled by the French government.
However, Pasztor said dozens of leaders still plan to attend.
"They think this is an important event," he said. "So they are putting their travel plans where their mouth is and they will be there to support the climate negotiations."
At the same time, he said, a huge number of climate-related events are being organized in Paris outside the center where the conference will take place.
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"Inevitably, where there's a situation where there's a state of emergency, there will be some impacts on those but still the events are going ahead and there's been a very strong sense both from Paris itself and the eventual participants that people intend to go to those meetings and intend to show solidarity with France and participate," Pasztor said.
While it's inevitable that leaders will discuss the coordinated attacks in Paris last Friday claimed by the Islamic State extremist group that killed 130 people, Pasztor said he expects their main focus to be on reaching an agreement, which all governments want.
Pasztor said 171 countries that collectively account for more than 90 per cent of emissions including top polluters China, the United States, the European Union and India have submitted national climate plans with targets.