The Duke of Cambridge said all three of his children enjoyed exploring the countryside around their home Anmer Hall, on the Sandringham estate in Norfolk.
Prince William added other young people, such as Greta Thunberg, were more environmentally aware than ever before – and won’t take no for an answer.
The Prince was speaking in the new ITV show, Prince William: A Planet For Us All, which features the Cambridge family as well as Sir David Attenborough. It followed the Prince over two years as he embarked on a global mission to champion action for the natural world.
He visits projects to stop poaching and the illegal ivory trade in Africa, as well as community-based environmental projects run by young people at home to protect sea life or create green spaces in inner cities.
He said: “Seeing my children, seeing the passion in their eyes and the love for being outdoors. They find a bug or they love watching how bees are forming honey.
“George, particularly, if he’s not outdoors, he’s quite like a caged animal. He needs to get outside.”
In the ITV film Prince William explained he got his love for nature after he was allowed to roam Sandringham as a child, described as a slice of the British countryside in miniature as it contains ancient woodlands, working farms and also a stretch of coast.
And that love had been passed on to his children as George, aged seven, is show with a garden tool in his hand as he tends a raised bed, Charlotte, five, holds a plant upside down as she removes it from a pot while wearing wellies and Louis, two, clutching a blue bucket as he explores the garden.
William adds: “I think you realise a lot more when you become a father.
“I was quite a happy go lucky young guy, enjoyed parties, and then all of a sudden you go, ‘well hang on a second, there’s a little person here, I’m responsible for that person.’”
In Liverpool, the Prince made a surprise visit to the Eco Emeralds founded by children to make insect friendly patches in towns and cities. Answering a question about whether George had taught him to do the floss dance he told the giggling children: “No, Charlotte can floss, she can already floss at four.
“You don’t want to see me floss. Catherine can floss bit I can’t, its like a really horrible film to watch me floss.”
Speaking about preserving nature, he said: “You can’t take it for granted. It’s so impressive and I think people forget just what’s on their back doorstep and how lucky we are to have such beautiful countryside.
“I mind awfully that if we are not going to protect the UK, then we are letting a very beautiful gem just disintegrate.”
Prince William: A Planet For Us All, ITV, 9pm tomorrow.