Prince William is scheduled to attend the COP30 climate summit in Brazil next month, as announced by the royal household.
Prince William and King Charles made a joint appearance on Thursday night at a event ahead of the environmental conference, which is set to be held in the Amazonian city of Belem.
The King and Prince were in attendance at the museum gathering, marking an rare public appearance together at a climate summit preparatory event arranged together with the UK government.
The King has been a longstanding advocate of environmental conservation - and the Prince of Wales has assumed the responsibility, with his own climate innovation awards, which will be held in Brazil ahead of the climate conference.
Palace insiders have described the Prince's participation at the next COP as assuming an significant responsibility in "climate diplomacy".
The monarch and his heir, making a joint entrance in the state Bentley, were greeted attendees such as environmentalists, scientists, environmental activists, diplomats and government officials.
This involvement involved presentations alongside President Emmanuel Macron of France and other international figures at the Blue Economy and Finance Forum in Monaco in recent months.
The climate conference will align with the William's personal climate innovation prizes, which will conclude in Rio de Janeiro the eve of he participates in the COP summit on the sixth of November.
Recently the William characterized the Earthshot finalists as "heroes of our time".
King Charles has been a key figure at previous climate summits, delivering the inaugural speech in Dubai for the 28th Conference of Parties, including the observation: "Our responsibility is to protect the world we inhabit".
"I have spent a large proportion of my life trying to raise awareness about the survival risks confronting humanity over global warming, global temperature increases and biodiversity loss," the King told attendees.
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