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WATCH: Prince William and Kate greet stars at Earthshot Prize awards
Childhood friends in Oman who figured out how to turn carbon dioxide into rock are among five winners chosen for the Prince of Wales's prestigious Earthshot Prize.
The annual awards were created by Prince William to fund projects that aim to save the planet.
Each winner will receive £1m ($1.2m) to develop their innovation.
Prince William announced the winners on Friday at an awards ceremony in Boston in the US.
"I believe that the Earthshot solutions you have seen this evening prove we can overcome our planet's greatest challenges," Prince William said during the ceremony.
"By supporting and scaling them we can change our future," he said.
The winning projects are based in Kenya, India, Australia, the UK and Oman.
Royal row turns US trip into a long three days
This is the second set of Earthshot Prizes awarded, after the first ever awards last year. The prize's name refers to the "Moonshot" ambition of 1960s America by then-President John F Kennedy, who pledged to get a man on the Moon within a decade.
Five Earthshot Prizes of £1m ($1.2m) are being awarded each year until 2030 in support of environmental innovation projects for the future. Nominations for the 2023 prize open up on 5 December.
This year's winners were chosen from a list of 15 finalists by a panel that includes Prince William, Sir David Attenborough, actress Cate Blanchett, footballer Dani Alves, Fijian activist Ernest Gibson and singer Shakira.
William and Catherine handed out awards to the five winners during a star-studded ceremony in Boston on Friday – with celebrities there including Billie Eilish, Annie Lennox, Ellie Goulding, Chloe x Halle and David Beckham.
Clean Our Air:
Protect and Restore Nature:
Build a Waste-free World:
Revive Our Oceans:
Fix Our Climate:
Talal Hasan, founder of 44.01 said winning the Earthshot Prize was "a proud moment" for his team.
"We started 44.01 two years ago because we saw the very real impact of climate change here in Oman," he said.
"Winning the Earthshot Prize will help us scale our solution around the world, and ultimately eliminate billions of tonnes of CO2. Climate change is the greatest challenge we have ever faced but being part of this amazing group of finalists give us hope."
Charlot Magayi, the CEO of Mukuru Clean Stoves, said 200,000 households in Kenya have had access to her product since she launched the business in 2017.
"The Earthshot Prize is going to help us reach one million households," she added.
Pierre Paslier, co-founder of the London start-up Notpla, said when the project started eight years ago in a student kitchen, "we would have never imagined we would be here today".
"No one wants to live in a world full of plastic waste but it's not too late to act," he said.
The ceremony is due to be broadcast at 17:30 GMT on Sunday on the BBC in the UK, and on Monday in the US.
Earlier on Friday, Prince William met US President Joe Biden as part of the royal couple's three-day trip to the US. It is Prince William and Catherine's first big international appearance since the death of the Queen.
However, the high-profile trip has been overshadowed by a racism row involving William's godmother, Lady Susan Hussey, a key member of the Royal Household, resigned after repeatedly asking a black British charity boss where she was "really" from.
Prince William's spokesperson has said "racism has no place in our society".
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