epa10342225 Britain's William, Prince of Wales (C-L) and Catherine, Princess of Wales (C-R) speak with startup companies that work at Greentown Labs as they tour the location for a view of green technologies, in Somerville, Massachusetts, USA, 01 December 2022. The Prince and Princess of Wales will attend the Earthshot Prize Awards Ceremony in Boston on 02 December, according to the Royal Household. EPA-EFE/ANGELA WEISS / POOL