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The winners of the second ever Earthshot prize have been announced!

They include childhood friends who turn CO2 into rock, a pair in the UK who have made plastic out of seaweed, and a company that makes stoves that use more environmentally-friendly fuel to burn.

The annual awards were created by Prince William last year to celebrate people inventing solutions to the ever-growing problem of climate change.

The Prince of Wales was at the ceremony in Boston in the US with his wife Catherine to present the winners with their prizes.

"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.

Each of the five winners of the 2022 Earthshot prize will receive £1 million to carry on developing their inventions.

This year's winners were chosen from a list of 15 finalists. The decision was made by a panel that includes Prince William, Sir David Attenborough, actress Cate Blanchett, footballer Dani Alves, Fijian activist Ernest Gibson and singer Shakira.

And the event itself was incredibly star-studded - Sir David Attenborough opened the ceremony, Billie Eilish performed, and Annie Lennox, Ellie Goulding, Chloe x Halle and David Beckham also made appearances.

The Earthshot ceremony is part of the Prince and Princess of Wales' American tour, which has been overshadowed by recent accusations of racism in the Royal Household.

Clean Our Air

Mukuru Clean Stoves, Kenya: Kenya's Mukuru Clean Stoves produce stoves that are fired using a combination of charcoal, wood and sugarcane. This replaces the solid fuels that most stoves use, 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 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: 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.

Revive Our Oceans

Australia: The Indigenous Women of the Great Barrier Reef in Australia were chosen for a programme that has trained over 60 women to protect the ocean using both traditional and digital methods.

Fix Our Climate

44.01, Oman: This project promises to turn carbon dioxide into peridotite, a rock that is really common in Oman and globally, including the US, Europe and Asia. It's a cheap and safe alternative to other methods of storing carbon, such as burying it underground.