UN secretary-general Ban Ki-moon has said he hopes Donald Trump will shift course on global warming and "understand the seriousness and urgency" of the problem.
"As president of the United States I'm sure that he will understand this, he will listen and he will evaluate his campaign remarks," Mr Ban said.
Mr Trump has called global warming a "hoax" on social media and pledged during his campaign to "cancel" the landmark Paris climate agreement adopted last year.
Speaking to reporters at his last UN climate conference as secretary-general, Mr Ban said he is sure the president-elect "will make a good, wise decision and I'm going to discuss this matter more in person".
The Paris Agreement was signed by more than 190 countries and has been formally approved by more than 100, including the US.
Mr Ban called international climate action "unstoppable" and said that no country, "however resourceful or powerful", is immune from the impacts of global warming.
Mr Trump's election has brought uncertainty about the US role in the Paris deal, which calls on all countries to reduce or curb greenhouse gas emissions and encourages rich countries to help poor ones deal with climate change.
French President Francois Hollande said the Paris Agreement is "irreversible" and the US must respect the decision by the Obama administration to join the deal.
Mr Hollande said France will hold a respectful dialogue with Mr Trump on climate change, but added that he "demands" US involvement on behalf of the more than 100 countries that have ratified the deal.