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.
The winning projects are based in Kenya, India, Australia, the UK and Oman.
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.
Who are the winners?
Mukuru Clean Stoves, Kenya: Kenya's Mukuru Clean Stoves is a female-founded business with mostly female staff. They produce stoves that are fired by processed biomass made from charcoal, wood and sugarcane instead of solid fuels, which can lead to air pollution and accidents that claim four million lives each year, the Earthshot Prize said.
Protect and Restore Nature:
Kheyti, India: In India, Kaushik Kappagantulu's Greenhouse-in-a-Box helps small-hold farmers protect their crops from extreme weather and pests, in a country that has been severely impacted by climate change.
Build a Waste-free World:
Notpla, United Kingdom: A waste-free solution from the UK was also among the winners, where Pierre Paslier and Rodrigo Garcia Gonzalez have been able to create natural, bio-degradable plastic made out of seaweed. The company made more than one million takeaway food boxes for the food delivery platform Just Eat this year.
Australia: The Indigenous Women of the Great Barrier Reef in Australia were chosen for a programme that has trained over 60 women in both traditional and digital ocean conservation methods.
44.01, Oman: In Oman, Talal Hasan's project 44.01 promises to turn carbon dioxide into peridotite, a rock that is found in abundance both in Oman and globally, including the US, Europe and Asia. It offers a low-cost and safe alternative to traditional methods of storing carbon, which include burying it underground in disused oil wells. (BBC)
PHOTO: Talal Hasan is the founder of 44.01, a project that promises to turn carbon dioxide into rock.