US President Barack Obama has turned interviewer for the BBC, in a special programme with naturalist David Attenborough.
Mr Obama and Mr Attenborough discuss climate change in the interview, to be aired on Sunday.
Climate change is one of Mr Obama's top issues for his remaining time in office.
"I have been a huge admirer of your work for a very long time," Mr Obama told Mr Attenborough.
It is the latest in a series of unusual media appearances for Mr Obama, who has been keen to tap almost any avenue that reaches as many people as possible to get his message out.
Last week, Mr Obama was interviewed by comedian Marc Maron for a viral podcast known as "WTF".
Earlier this year, he talked to green-lipstick-wearing comedian GloZell Green and other YouTube celebrities with huge followings.
To reach young people he wanted to sign up for Obamacare, his signature health care insurance program, he talked to comedian Zach Galifianakis for the web series "Between Two Ferns".
Mr Attenborough, 89, has been making television documentaries for 60 years.
The BBC has called him "the godfather of natural history TV".
Mr Obama's interview with Attenborough about climate change was taped on 8 May, and will air on BBC, BBC America and 20 other broadcasters around the world, a White House official said.
It comes as Mr Obama's administration is finalising rules to curb carbon emissions from power plants.
Mr Obama has pushed world leaders to agree to new targets at a summit later this year in Paris.
Mr Obama told Mr Attenborough that kids are "much more environmentally aware" than adults, citing his daughters Malia, 16, and Sasha, 13, as examples.
"They do not dispute, for example, the science around climate change," Mr Obama said in the clip.
Mr Attenborough agreed that adults lose the fascination with nature that is common among children.
"A five-year-old, turning over a stone and seeing a slug, and says, 'What a treasure!' Kids understand the natural world," Mr Attenborough said.