Britain's Prince Charles' movie 'Harmony' will be screened at the Sundance Film Festival in London.
The first-in-line to the throne will have his film - which tells the story of how he worked environmental campaigners and business leaders to help change attitudes towards sustainable living - screened on Saturday 28th of April .
It is narrated by the prince, and includes footage of when the prince interviewed former US presidential candidate Al Gore in 1998.
It will be introduced by the festival's founder Robert Redford.
Afterwards a question and answer session will take place with filmmakers Tony Juniper and Ian Skelly, where the making of the film and the environmental issues it addresses will be discussed.
Prince Charles has long been passionate about ecological issues, and last year warned the human race faces extinction if attitudes to conservation didn't change.
He said: "Its ultimate impact is plainly not at all clear to most people: without the biodiversity that is so threatened, we won't be able to survive ourselves."