French President-elect Emmanuel Macron told his US counterpart Donald Trump in a telephone call this evening that he would defend a climate change deal agreed in Paris in 2015, his spokeswoman said.
"He is going to protect the climate change agreement, and he is going to make sure he will be vigilant in protecting the French people," Laurence Haim told CNN.
She said the two had also discussed during their ten-minute conversation issues including the fight against terrorism, transatlantic relations and the economy.
Climate change "is a very important and sensitive issue for the French. He told him [Mr Trump] that he will protect what was made in Paris," Ms Haim said.
Mr Trump earlier tweeted his congratulations for what he said was Mr Macron's "big win".
Congratulations to Emmanuel Macron on his big win today as the next President of France. I look very much forward to working with him!
— Donald J. Trump (@realDonaldTrump) May 7, 2017
French President Francois Hollande earlier confirmed that Mr Macron will be inaugurated next Sunday as the pair attended their first public meeting together since the centrist's resounding election victory yesterday.
Mr Hollande smiled and clasped the arms of his one-time economy minister as the two men attended a ceremony at Paris's Arc de Triomphe to commemorate victory over the Nazis in World War II.
The president walked beside Mr Macron to the Tomb of the Unknown Soldier at the monument, where they laid a wreath.
Mr Hollande plucked Mr Macron from obscurity three years ago when he named the former investment banker his economy minister, marking the start of his meteoric rise to his electoral victory over far-right leader Marine Le Pen.
Mr Macron's victory, which also smashed the dominance of France's mainstream parties, will bring huge relief to European allies who had feared another populist upheaval to follow Britain's vote to quit the EU and Mr Trump's election as US president.
With all votes counted, Mr Macron had topped 66.1% against 33.9% for Ms Le Pen - a gap wider than the 20 or so percentage points that pre-election surveys had suggested.
Even so, it was a record performance for the National Front, a party whose anti-immigrant policies once made it a pariah, and underlined the scale of the divisions that Mr Macron must now try to heal.
World leaders welcome the election of Emmanuel Macron in France #Presidentielle2017 pic.twitter.com/oWvP6GLBnV
— RTÉ News (@rtenews) May 8, 2017
After winning the first round two weeks ago, Mr Macron had been accused of behaving as if he was already president. Last night, with victory finally sealed, he was much more solemn.
"I know the divisions in our nation, which have led some to vote for the extremes. I respect them," Mr Macron said in an address at his campaign headquarters, shown live on television.
"I know the anger, the anxiety, the doubts that very many of you have also expressed. It's my responsibility to hear them," he said.
"I will work to recreate the link between Europe and its peoples, between Europe and citizens."
His immediate challenge will be to secure a majority in next month's parliamentary election for a political movement that is barely a year old, rebranded as La Republique En Marche ("Onward the Republic"), in order to implement his programme.
Macron's first priorities will be to assemble a cabinet and also to prepare for June's legislative elections, says @tconnellyRTE pic.twitter.com/WLVw4mkOnV
— RTÉ News (@rtenews) May 8, 2017
Macron: From unknown government adviser to president of France
Le Pen campaign fails to convince enough voters
Analysis by Europe Editor Tony Connelly
Attention is now turning to Emmanuel Macron's cabinet, and his ability to govern, given that as yet he has no MPs. His political movement is in its infancy.
Mr Macron has hinted he has someone in mind as prime minister, and has suggested in the past that he would like a female prime minister, with the centrist MEP Sylvie Goulard sometimes mentioned as a candidate.
But his honeymoon period is likely to be brief, despite the youthful optimism with which he has suddenly captured the French imagination.
One third of the electorate either abstained or cast blank or spoiled votes, meaning his 66% victory is tempered with the knowledge that many voters who rejected Marine Le Pen could not bring themselves to support Mr Macron.
He has proposed an ambitious reform agenda, hoping to relax rigid labour laws which he believes fuel high unemployment.
He also wants to cut public spending but also to improve education in deprived areas and increase welfare protections to the self-employed. The task, he admits, is immense.
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President Michael D Higgins and Taoiseach Enda Kenny have both congratulated Mr Macron on his victory.
Minister for Foreign Affairs Charlie Flanagan said the election marks an important moment for both France and Europe.
Speaking on RTÉ's Morning Ireland, he said Mr Macron's success shows the centre in Europe is "very much holding" and not falling apart as predicted.
He also said Mr Macron's position on corporate tax rates is "nothing new" and Ireland's position is quite clear.
President of the EU Council Donald Tusk and European Commission President Jean-Claude Juncker also both welcomed the outcome.
A spokesman for German Chancellor Angela Merkel said the win was a victory for a strong united Europe, while British Prime Minister Theresa May said she looked forward to working with Mr Macron on a wide range of shared priorities.
Russian President Vladimir Putin urged Mr Macron to bridge deep rifts and work together to fight the "growing threat of terrorism and violent extremism".
Japan's Prime Minister Shinzo Abe also congratulated the new French president.
Mr Macron will become France's youngest leader since Napoleon.
A 39-year-old former investment banker, he served for two years as economy minister under Mr Hollande but has never previously held elected office.
Ms Le Pen said she had also offered her congratulations. But she defiantly claimed the mantle of France's main opposition in calling on "all patriots to join us" in constituting a "new political force".
Her tally was almost double the score that her father Jean-Marie, the last far-right candidate to make the presidential runoff, achieved in 2002, when he was trounced by the conservative Jacques Chirac.
Her high-spending, anti-globalisation "France-first" policies may have unnerved financial markets but they appealed to many poorer members of society against a background of high unemployment, social tensions and security concerns.
