On Sunday, the Duke and Duchess of Cambridge walked the “Green Carpet” to the inaugural Earthshot Prize awards ceremony held at Alexandra Palace in London. On theme with the sustainable event, Kate Middleton wore a favorite 2011 Alexander McQueen look, a silver-white Grecian-style gown with a gold belt to cinch the waist. She previously wore the same outfit to a BAFTA event while taking her first ever royal tour of Canada and the U.S.

At her side, Prince William wore a green velvet suit over a black turtleneck.

the earthshot prize 2021
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The event was organized by Prince William and The Royal Foundation and the prize offers £1 million to five different environmental activists and entrepreneurs towards their initiative, from a shortlist of fifteen nominees. There is a star-studded list of performances and high-profile presenters, including Emma Watson, Emma Thompson and the duchess herself.

Performances at the event include Ed Sheeran, Coldplay, KSI, Yemi Alade, and Shawn Mendes; as a special part of the show, Coldplay's performance will be powered by energy produced by sixty cyclists.

Prince Charles spoke before the night in support of his son, saying, “I am very proud of my son William for his growing commitment to the environment and the bold ambition of the Earthshot Prize.”

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No guests were flown in for the night, as part of the Earthshot's commitment to sustainability. There was a paperless policy and plant-based food for guests.

“I am honored to introduce the 15 innovators, leaders, and visionaries who are the first ever finalists for The Earthshot Prize,” the Duke of Cambridge said in a statement. “They are working with the urgency required in this decisive decade for life on Earth and will inspire all of us with their optimism in our ability to rise to the greatest challenges in human history.”