The 10 year, £10 million Earthshot Prize was set up last year by Prince William to help find innovative solutions to heal the planet.
Over 750 nominations were received.
The 15 finalists, three in each of five categories, have now been announced…
Protect and Restore Nature category
- The Pole Pole Foundation in the Democratic Republic of the Congo, a community-led conservation initiative protecting gorillas and local livelihoods
- The Republic of Costa Rica for a pioneering scheme paying local people to help revive rainforest
- Restor, an online conservation platform in Switzerland.
Clean Our Air category
- The Blue Map app, China, an environmental database
- Takachar, India, which creates products from agricultural waste
- Vinisha Umashankar, a 14-year-old activist from India who has designed a solar-powered steam-ironing cart.
Revive Our Oceans category
- Coral Vita, Bahamas, for restoring dying coral
- Living Seawalls, Australia, for helping bring marine life back to coastal sea defences
- Pristine Seas, USA, a global conservation programme.
Build A Waste-free World category
- The City of Milan food waste hubs in Italy
- Sanergy, Kenya, for converting human waste into safe products for local farmers
- Wota Box, Japan, water treatment plant turning waste water into clean water.
Fix Our Climate category
- AEM Electrolyser, Thailand, Germany and Italy, for developing green hydrogen technology
- Reeddi Capsules, Nigeria, bringing affordable electricity to energy-poor communities
- Solbazaar, Bangladesh, peer-to-peer energy exchange network.
The winners will be announced at an awards ceremony in London on 17 October.