In my introduction to the 'Earthshot: How to Save our Planet' book, I wanted to share the early conversations in 2018 that led to the Prize's creation & the simple equation that captures my theory behind @EarthshotPrize: Urgency + Optimism = Action

Available 30th September pic.twitter.com/FEy6W7V8LI

— The Duke and Duchess of Cambridge (@KensingtonRoyal) September 17, 2021