The Prince of Wales is scheduled to attend the COP30 climate summit in Brazil during November, as confirmed by royal officials.
Prince William and King Charles appeared together on Thursday evening at a gathering ahead of the environmental conference, which is scheduled to take place in the northern Brazilian city of Belem.
The King and Prince were in attendance at the Natural History Museum reception, marking an unusual joint appearance at a environmental conference preliminary meeting arranged together with the United Kingdom administration.
King Charles has been a long-time champion of protecting nature - and the Prince of Wales has inherited the mission, with his own environmental prize initiative, which will be held in Brazil ahead of the UN meeting.
Official representatives have portrayed the Prince's participation at the forthcoming conference as taking on an significant responsibility in "global climate discussions".
The monarch and his heir, arriving together in the state Bentley, were introduced to attendees such as environmentalists, scientists, environmental activists, diplomats and government officials.
This participation involved presentations in concert with President Emmanuel Macron of France and other global statesmen at the Blue Economy and Finance Forum in Monaco earlier this year.
The UN meeting will align with the the royal's sustainability recognition program, which will conclude in the Brazilian city the eve of he participates in the COP summit on 6 November.
Last week the William referred to the prize competitors as "heroes of our time".
The monarch has been a prominent presence at past COP meetings, delivering the inaugural speech in Dubai for COP28, including the observation: "Our responsibility is to protect the world we inhabit".
"I have spent a substantial portion of my life trying to raise awareness about the existential threats challenging our world over climate change, environmental shifts and species extinction," the King told attendees.
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