Britain's Prince William, Duke of Cambridge and Britain's Catherine, Duchess of Cambridge speak with guests as they attend the inaugural Earthshot Prize awards ceremony at Alexandra Palace in London on October 17, 2021. - The Earthshot Prize honours five inaugural winners with an award of L1 million ($1.4 million, 1.2 million euros) each to pursue solutions to the world's greatest environmental problems at a glitering gala ceremony. Prince William, Duke of Cambridge, launched the prestigious Earthshot Prize in October 2020 and hopes that the event will help propel the fight against climate change leading up to the COP26 summit in Scotland, calling those on the shortlist "innovators, leaders and visionaries". (Photo by Alberto Pezzali / POOL / AFP) / Embargoed until 2000 GMT