Rachel Russell is a news correspondent for the British Broadcasting Corporation.
The Prince of Wales praised the people who supported the prize.
The prince said protecting the planet was something close to the Queen's heart.
He told them that he took comfort in their continued enthusiasm, optimism and commitment.
£50 million will be awarded over a decade for his Earthshot project.
The goal is to find 50 solutions by the year 2030.
Prince William was supposed to attend a conference in New York with previous Earthshot prize winners, but the Royal Family is still mourning the death of Queen Elizabeth.
Instead, the prince sent a video message - recorded at Windsor the day after the Queen's funeral - to conference delegates in which he said "during this time of grief, I take great comfort in your continued enthusiasm, optimism and commitment to the Earthshot Prize and what we are trying to
My grandmother was a big fan of protecting the environment. She would have been happy to hear about it.
The new Prince of Wales is following in his father's footsteps by campaigning for the environment.
Prince William stepped back from his role in warning about climate change when he became heir to the throne.
John F Kennedy's brief US presidency was associated with the optimism of a younger generation and a hope for social and technological progress.
The Princess of Wales will accompany him to Boston for the Earthshot award ceremony.
When Catherine was pregnant with Princess Charlotte, the royal couple went to New York for three days.
The Prince became the president of the environmental project in July.
William said in his message that the world was an uncertain place and that many people were facing unimaginable challenges.
He said that a changing global climate would only serve to entrench the immediate challenges into fundamental global issues.
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