Prince William visits the John F. Kennedy Presidential Library and Museum in Dorchester, Massachusetts.

(AP) The Prince and Princess of Wales have visited a green technology startup incubator in suburban Boston and a nonprofit that gives young people the tools to stay out jail and away from violence.

William and Kate are in the United States for their first overseas visit since the death of Queen Elizabeth II.

On Thursday, they heard about solar-powered autonomous boats and low-carbon cement at the incubator Greentown Labs. The royal couple’s trip comes as they look to foster new ways to address climate change. It culminates Friday with the prince’s signature Earthshot Prize, a global competition aimed at finding new ways to tackle climate change.

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