The analyst added: “His elbows are held out at just the right angle to support that sense of confidence and his hand gestures are open, with the second, inward-cupping gesture suggesting his ownership over the project.”

William has inherited his passion for the environment from his father Prince Charles, 72, who is a longtime campaigner for green issues.

Charles launched his own Terra Carta initiative earlier this year, encouraging global businesses to sign-up and pledge to be more environmentally friendly.

On Friday, Clarence House shared a new clip of Charles plugging the scheme among highlights from the past year on Twitter.