Central to the summit was countering Trump's main argument that the 2015 Paris accord on reducing global emissions would hurt USA business.
Key U.S. figures in Paris on Tuesday agreed.
"It is a fact that fossil fuels remain heavily subsidized - meaning we are investing in our own doom", he emphasized, noting cities, regions, states and territories across the globe along with thousands of private enterprises - including major oil and gas companies - are already taking climate action, resulting in new industries and markets as well as in healthier environments and more jobs.
"You will now settle in, develop projects, enrich French, European research, because we've chose to give even bigger resources and to fully recognize what you are doing", Macron, who repeatedly failed in his bid to persuade Trump to reverse the decision, addressed grant winners.
"There is a clear moral imperative for developed economies such as the United Kingdom to help those around the world who stand to lose most from the consequences of man-made climate change". CBS News has sought clarification from the French government on how any invites to USA officials were extended.
Speaking ahead of the summit Macron said he was hopeful US President Donald Trump would reconsider his decision to take the US out of the climate pact.
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The US President has since signalled a desire to renegotiate the terms, though Mr Macron has ruled out any backtracking.
The global financial institution said at the One Planet Summit in Paris that its decision would "align its support to countries to meet their Paris goals".
It comes two years to the day since the historic Paris Agreement was signed. It's extremely aggressive to decide on its own just to leave, and no way to push the others to renegotiate because one chose to leave the floor.
"I understand that private investors come and consider investments for example in Africa, that they would like to have this additionnal reassurance", he says. "Nonethless the agreement has been weakened", he said.
Macron invited USA researchers, and soon other non-French climate researchers, to compete for the opportunity to conduct their work at French institutions like La Sorbonne or Paris-Saclay.
"I think that's not a good sign", Baerbock told public broadcaster Deutschlandfunk.
Companies' performances in this area would be reported on each year so their improvements could be tracked, she said. But it's also about testing the willingness of the private sector to commit to the climate change fight.