Prince William has praised environmental innovators as the "world's true action heroes", describing them as the role models we need "in these uncertain times" at his Earthshot awards in Rio.

Joined on stage by four young people from Brazil at his annual ceremony, William explained his motivation to set up the prize, saying of the finalists: "Their stories are the inspiration that gives us courage."

"And there's a great deal we can learn from their determination and their vision for scale," he added.

"As well as their unyielding belief that we can create a better world. It's no exaggeration to say that they are the world's true action heroes."

For the fifth year of his environmental prize, which sees five innovators or entrepreneurs awarded £1m each, he was joined by singers Kylie Minog

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