Donald Trump has said he was pressed on climate change by the Prince of Wales during their meeting at Clarence House on Monday.
Charles “did most of the talking” during their 90-minute chat, according to the US President.
Mr Trump, who has previously accused climate experts of having a “political agenda”, told ITV’s Good Morning Britain he “totally listened” to the prince when the issue came up.
He said: “What he really feels one way about is the future.
“He wants to make sure future generations have climate that is good climate as opposed to a disaster, and I agree.
“I did mention a number of things, I did say the United States right now has among the cleanest climates.”
Asked if Charles moved him on the issue, he said: “What moved me was his passion for future generations, he’s really not doing this for him, he’s doing this for future generations.
“This is real, he believes that. He wants to have a world that’s good for future generations and I do, too.
“He’s Prince Charles, he doesn’t have to worry about future generations unless he’s a very good person who cares about people, and that’s what impressed me, maybe the most.”
Mr Trump also mentioned China, India and Russia, urging them to take more responsibility for their pollution.
Before his state visit, hundreds of climate change experts urged Prime Minister Theresa May to confront him over his approach to the issue.
A letter signed by 250 academics from universities and research bodies across the UK stated that his refusal to tackle global warming is “increasing risks for lives and livelihoods” around the world.