A project to restore tropical forests and a global ocean treaty initiative are among the winners of this year's Earthshot Prize.
The winners, named at an awards ceremony in Brazil on Wednesday, will each be given £1m to scale up their projects to repair the climate.
The Prince of Wales, who founded the global environmental award in 2020, said the winners were an inspiration and proof that progress is possible.
Brazilian football legend Cafu, Olympian Rebeca Andrade and former Formula 1 driver Sebastian Vettel were among the presenters, while pop stars Kylie Minogue and Shawn Mendes performed at the ceremony in Rio de Janeiro's Museum of Tomorrow.
UK Prime Minister Sir Keir Starmer, Energy Secretary Ed Miliband and London Mayor Sir Sadiq Khan were also in attendance.
Prince William, who is the president of the prize, told those gathered at the ceremony that he had founded the award with the aim of making this the decade in which we transformed our world for the better.
He emphasized the need for real, lasting changes that protect life on Earth, drawing comparisons to the Moonshot project initiated by former US President John F. Kennedy.
The Earthshot Prize focuses on five key areas: Protect and Restore Nature; Clean Our Air; Revive Our Oceans; Build a Waste-Free World; and Fix Our Climate.
This year, nearly 2,500 nominees were submitted from 72 countries, with 15 finalists selected and five winners chosen.
The prize aims to support innovative projects like re.green in Brazil, which focuses on protecting the Atlantic Forest, and the High Seas Treaty which aids marine life conservation.
Chief executive of re.green, Thiago Picolo, remarked that winning the prize validates their direction and helps facilitate essential conversations for project funding.
Prince William praised the winners' optimism and vision, stating that their initiatives embody a spirit of collective action for a sustainable future.
The event marked a highlight of Prince William's five-day visit to Brazil, focused on climate change advocacy.
