The Prince of Wales will deliver the opening address at the Cop26 UN climate change summit, Clarence House has announced.
During the day, a series of royal events in support of Cop26 will be staged.
Charles, the Duchess of Cornwall and the Duke and Duchess of Cambridge will join an evening reception the Queen will now not attend as she continues to rest.
Charles will also co-host the Great Green Wall session, alongside French President Emmanuel Macron and his Mauritanian counterpart Mohamed Ould Abdel Aziz.
William and Kate will join Charles to host a reception for key members of his Sustainable Markets Initiative and winners and finalists from William’s environmental Earthshot Prize Awards.
The Palace said in a statement: “Following advice to rest, the Queen has been undertaking light duties at Windsor Castle.
“Her Majesty has regretfully decided that she will no longer travel to Glasgow to attend the Evening Reception of COP26 on Monday, 1st November.
“Her Majesty is disappointed not to attend the reception but will deliver an address to the assembled delegates via a recorded video message.”