Speaking to a group of communications and media leaders as well as financiers and academics known as Les Napoleons, Obama regretted what he called a "temporary absence of American leadership" on climate change.
When former President Barack Obama spoke to a leadership forum in India's capital last week, he never once used the words "Donald Trump" and was careful to avoid any direct reference to his successor in the White House.
The earliest the U.S. can withdraw from the Paris agreement is November 2020.
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NCAA emphasized that the punishments were instated in part because the school failed to control the athletic department. Ole Miss announced it would appeal the sanctions levied against its football team by the NCAA Friday morning.
Macron and Trump are also at odds on the issue of the Iranian nuclear deal negotiated by the Obama administration, which the French leader wants to save.
Earlier in the day, Obama had lunch with President Emmanuel Macron at the Elysee palace - although the French presidency told Reuters that was in a "private capacity" and did not publicize the event with the usual tweet or official photo. "Hope is not being blind to problems", Obama said.
Obama was speaking before a group of some 800 French CEOS, celebrities and public officials at an invitation-only conference in France called the Napoleons, where he lamented the USA withdrawal from the Paris climate accord, an agreement he had signed in 2015.
"We discussed the big challenges of the planet and especially the subject of the climate".