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Prince William wrapped a whirlwind week highlighted by the Earthshot Prize in Brazil with tradition and commitment on Remembrance Sunday

"The momentum is really feeling unstoppable," a palace source tells PEOPLE about William's Earthshot energy

The heir to the throne has shown steadiness through a turbulent time for the royal family as his uncle Andrew Mounbtatten Windsor's princely title was stripped

From the Earthshot Prize to an emotional Remembrance Sunday, Prince William 's busy week between Brazil and London told the same story in two acts: a future king protecting the future and honoring the past.

"He’s leaving Rio with a renewed sense of optimism about what Earthshot can deliver. We’re seeing the impact Earthshot finalists are delivering. The momentum is really

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