Sharing a photo showing his arm around William, Charles wrote on social media: "I am very proud of my son, William, for his growing commitment to the environment and the bold ambition of the Earthshot Prize. Emma Thompson arrives at The Earthshot Prize Awards Ceremony, in London. Hours before the ceremony began Prince Charles said he was "proud" of his son for developing the Earthshot Prize. The awards are Prince William's most ambitious project in the royal family yet and his biggest effort to curb the climate crisis. READ MORE: Prince William's poignant new project kicks off: 'Fix our climate' Emma Watson walks the green carpet at The Earthshot Prize Awards. The ceremony is being hosted by Clara Amfo and Dermot O'Leary. Thompson chose an emerald green Stella McCartney suit she first wore to Buckingham Palace when she received her damehood for services to drama from Prince William in 2018. (Joe Maher/Getty Images)Īll guests were told not to buy anything new to wear for the ceremony, which Thompson described as a "relief". READ MORE: Prince William and Kate launch global prize to 'repair the Earth' The Duke and Duchess of Cambridge at The Earthshot Prize Awards. The Duchess was among those presenting an award.Ī number of celebrities have also walked the green carpet including actresses Emma Thompson and Emma Watson. William is wearing a green velvet jacket and turtleneck. The Duchess also wore her iconic Garrard-designed sapphire and diamond engagement ring - one of many pieces Kate has worn from Princess Diana's collection - and a pair of diamond and morganite earrings by Kiki McDonough, first seen at the wedding of Pippa Middleton to James Matthews in 2017. Kate wears a recycled Alexander McQueen gown to The Earthshot Prize Awards.