The Prince of Wales is scheduled to attend the United Nations climate conference in South America in the coming weeks, according to the royal household.
Prince William and King Charles made a joint appearance on Thursday evening at a reception ahead of the environmental conference, which is set to be held in the northern Brazilian city of Belém.
Father and son were present at the Natural History Museum reception, marking an noteworthy combined presence at a climate summit preparatory event arranged together with the UK government.
The King has been a long-time champion of biodiversity preservation - and the Prince of Wales has inherited the mission, with his own Earthshot awards, which will be hosted in Rio preceding the climate conference.
Royal sources have described Prince William's attendance at the next COP as taking on an important role in "climate diplomacy".
The King and Prince of Wales, making a joint entrance in the royal vehicle, were introduced to guests including environmentalists, researchers, climate change campaigners, diplomats and politicians.
This engagement included speaking in concert with President Emmanuel Macron of the French Republic and other global statesmen at the Blue Economy and Finance Forum in the Principality of Monaco earlier this year.
The UN meeting will dovetail with the prince's own sustainability recognition program, which will finish in Rio de Janeiro the day before he participates in the climate conference on November 6th.
Last week the prince characterized the prize competitors as "modern-day pioneers".
The King has been a key figure at previous climate summits, providing the introductory remarks in the United Arab Emirates for COP28, including the statement: "The Earth does not belong to us, we belong to the Earth".
"Throughout my life I've dedicated a significant amount of my life trying to warn of the survival risks confronting humanity over global warming, global temperature increases and ecological decline," the King told delegates.
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