epa10342224 Britain's William, Prince of Wales (C-R) and Catherine, Princess of Wales (C-L) tour Greentown Labs 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