Read about award-winning projects trying to help the planet

The winners for this year's Earthshot Prize have been announced in Rio de Janeiro, Brazil.

The competition runs every year and was launched back in 2020 by Prince William.

The aim is to recognise and celebrate people who've come up with big ideas to help tackle issues affecting the planet and the environment.

The winners of each category win £1 million to further develop their ideas.

So which ideas won? Read on to find out.

Winner: Protect and Restore Nature

The Protect and Restore Nature award is all about projects that look at growing the natural world, not shrinking it.

This year re.green took the prize in this category.

The company restores and protects the Amazon rainforest and the Atlantic rainforest by using AI, drones and and satellite imagery.

Winner: Clean Our Air

The city of Bogotá, which is the capital of Colombia, was the winner of the Clean Our Air prize.

The award is all about ensuring that everyone breathes clean and healthy air, and goes to people who's efforts clean the air or help to remove pollution from it.

Since 2018, air pollution in Bogotá has fallen by 24%, despite the number of people who live there growing.

To help achieve this, the city has electric buses which produce less air pollution, and it created the largest cycle path network in Latin America.

Winner: Revive Our Oceans

The prize for Revive Our Oceans is all about repairing and preserving oceans and looking after sealife.

This year the High Seas Treaty won the award.

Around two-thirds of the world's oceans aren't controlled by one country, which also means it's not protected by the laws of any one country.

So, the High Seas Treaty aims to protect the seas by creating rules that lots of countries promise to follow, so that ocean life is cared for.

Winner: Build a Waste-Free World

Building a Waste-Free World prize is all about minimising waste and using leftovers from one process in something else too.

Lagos Fashion Week in Nigeria won the award this year.

Only 1% of textiles are recycled into new garments which means there's lots of clothing waste and pollution.

Lagos Fashion Week aimed to show how the industry could be less wasteful and more sustainable, by showcasing how materials could be used in ways that are good for the planet, and also by transporting clothes in an environmentally friendly way.

Winner: Fix Our Climate

Areas by the sea in Bangladesh are particularly affected by climate change

Friendship won the Fix Our Climate award this year, for its work protecting vulnerable communities in Bangladesh.

In Bangladesh, people are already experiencing the impacts of climate change, which is affecting homes and people's ability to go to school or work.

Friendship started off as a floating hospital but has grown to helps communities prepare for natural disasters and also supports them in other areas of life too - such as schools and education - with a focus on sustainability.