The Prince of Wales will represent the United Nations climate conference in South America next month, as announced by palace sources.
Prince William and King Charles appeared together on Thursday night at a event ahead of the climate summit, which is set to be held in the Amazonian city of Belem.
Father and son were present at the museum gathering, marking an unusual joint appearance at a climate summit preparatory event arranged together with the British authorities.
The King has been a long-time champion of protecting nature - and the Prince of Wales has inherited the mission, with his own Earthshot awards, which will be held in Brazil before the COP summit.
Official representatives have characterized William's involvement at the upcoming climate summit as assuming an significant responsibility in "global climate discussions".
The King and Prince of Wales, making a joint entrance in the state Bentley, were introduced to guests including conservation experts, researchers, climate change campaigners, diplomats and government officials.
This participation featured addresses alongside President Emmanuel Macron of the French Republic and other international figures at the Blue Economy and Finance Forum in the Principality of Monaco during the current year.
The climate conference will dovetail with the prince's own climate innovation prizes, which will wrap up in the Brazilian city the previous day he joins the climate conference on the sixth of November.
In recent days the William described the prize competitors as "heroes of our time".
King Charles has been a influential participant at previous climate summits, delivering the inaugural speech in Dubai for COP28, including the reminder: "Our responsibility is to protect the world we inhabit".
"For decades I've committed a large proportion of my life trying to warn of the survival risks challenging our world over global warming, climate change and species extinction," the King told participants.
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