United Kingdom, Oct. 9 -- King Charles' "fondest hope" is that his new documentary will encourage a new generation to help save the planet.

The 76-year-old monarch has long been an advocate for the environment and his upcoming Amazon Prime film, Finding Harmony: A King's Vision, will see him reflect on his commitment to promoting a sustainable world and he wants it to shine a spotlight on ways of working "with, rather than against, nature".

To mark the announcement of the documentary, a new portrait of the king has been released and he said: "Nature is our sustainer; we are a part of nature.

"Therefore, what we do to her, we do to ourselves. For much of my life, I have sought to promote and encourage ways we can work with, rather than ...