Prince William's children have driven home for him how urgent it is to "fix the planet".
The Prince of Wales - who has Prince George, 12, Princess Charlotte, 10, and Prince Louis, seven, with wife Catherine, Princess of Wales - has unveiled the finalists for this year's Earthshot Prize.
As he did, William reflected on how quickly the five years have passed since he first announced the initiative, which rewards those offering innovative solutions to the world's environmental challenges.
He said in a short film shared on his social media channels: "now, more than ever, is the time to fix the planet.
"I sat under this oak tree five years ago, soon after we launched The Earthshot Prize. The planet, the only home we have, needed our help, as scientists made it clear that we had to make sign