The Prince of Wales has announced the finalists of this year's Earthshot Prize, describing them as "heroes of our time". And as he prepares to take the Prize to Rio de Janeiro next month, five years into the ambitious 10-year, £50million environmental prize programme to solve some of the planets greatest challenges, he has reflected on a "critical decade".

"Back then, a decade felt a long time," he says. "George was seven, Charlotte five and Louis two; the thought of them in 2030 felt a lifetime away. But today, as we stand halfway through this critical decade, 2030 feels very real."

In a video message in which he is seen sitting beneath an oak tree, he adds: "2030 is a threshold by which future generations will judge us; it is the point at which our actions, or lack of them, will have

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