Kate Middleton Surprises at Earth shot Prize Awards in Boston!

Kate Middleton and Prince William arrived in style at the Boston Earth shot Prize Awards.

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Yesterday, William and Kate joined the MGM Music Hall's second annual prize presentation to conclude their three-day U.S. visit. The event's eco-friendly concept required visitors to wear secondhand clothes.

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Kate hired a bright green off-the-shoulder Solace London gown from U.K. designer dress rental site HURR to follow sustainable fashion principles.

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She wore Princess Diana's emerald and diamond choker. Asprey platinum halo emerald and diamond earrings adorned her. William reused his blue velvet blazer from royal functions.

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Earshot's five category winners will each get $1 million in prizes for their projects. On Friday night, Kheyti from India, Indigenous Women of the Great Barrier Reef from Australia,

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Mukuru Clean Stoves from Kenya, Notpla from the U.K., and 44.01 from Oman were named champions.

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Comedian Catherine O'Hara, Rami Malek, and actor and activist Shailene Woodley will present the awards. Like last year, Princess Kate will present a major prize. Presenter David Beckham.

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Daniel Dae Kim and BBC Radio 1's Clara Amfo host the awards. Prince William mentioned the Earth shot Prize to Malek at a movie presentation.

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"We raised it at the Bond premiere. I loved his spirit "on the green carpet. "Sir David Attenborough and William's love of the Moonshot and President Kennedy. We talked about my childhood idol, President Kennedy."

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"And here we are in a spot that is much beyond that, and I admire Prince William and everyone who can join together to discover inventive ways

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to help fix this global crisis because we can all put our heads together," he continues.

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Prince William addressed the ceremony: "This evening's Earth shot solutions how we can solve our planet's biggest problems. Supporting and scaling them can change our future."

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"Our choices will impact future generations," he remarked. We must choose hope, optimism, and haste to rebuild our planet.

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The Prince of Wales founded the 2020 Earth shot Prize Awards to inspire urgent optimism about environmental concerns, including climate change.

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"Excited to be able to bring it to the United States and motivate people stateside and across the world through the wonderful stories we are going to tell," a source tells PEOPLE.

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"The reward has become the Prince's Super Bowl event of the year," the source said.

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"He looks straight to continuing to use the stage each year to put a light on some of the most influential projects doing wonderful things throughout the world to rescue our planet's future."

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