The Prince of Wales is scheduled to attend the United Nations climate conference in Brazil in the coming weeks, as announced by the royal household.
The father and son duo made a joint appearance on Thursday evening at a event preceding the climate summit, which is planned for in the Amazonian city of Belem.
The King and Prince were in attendance at the museum gathering, marking an unusual joint appearance at a environmental conference preliminary meeting organized in partnership with the British authorities.
King Charles has been a consistent supporter of environmental conservation - and the Prince of Wales has inherited the mission, with his own environmental prize initiative, which will be taking place in South America ahead of the UN meeting.
Palace insiders have characterized the Prince's participation at the forthcoming conference as stepping up an significant responsibility in "environmental negotiations".
The King and Prince of Wales, making a joint entrance in the official car, were greeted guests including environmentalists, scientists, environmental activists, diplomats and politicians.
This engagement featured addresses in concert with President Emmanuel Macron of the French Republic and other international figures at the Blue Economy and Finance Forum in Monaco during the current year.
The UN meeting will dovetail with the William's personal Earthshot environmental awards, which will wrap up in the Brazilian city the eve of he participates in the climate conference on the sixth of November.
Recently the prince referred to the prize competitors as "heroes of our time".
The King has been a prominent presence at previous climate summits, delivering the inaugural speech in Dubai for COP28, including the statement: "Our responsibility is to protect the world we inhabit".
"For decades I've committed a significant amount of my life trying to warn of the survival risks facing us over global warming, climate change and ecological decline," the monarch informed participants.
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