Prince William will represent the United Nations climate conference in Brazil next month, according to royal officials.
Prince William and King Charles appeared together on Thursday evening at a reception leading up to the environmental conference, which is scheduled to take place in the northern Brazilian city of Belém.
The royal pair were in attendance at the scientific institution event, marking an noteworthy combined presence at a environmental conference preliminary meeting arranged together with the British authorities.
The King has been a longstanding advocate of environmental conservation - and Prince William has assumed the responsibility, with his own climate innovation awards, which will be taking place in South America preceding the climate conference.
Official representatives have portrayed William's involvement at the forthcoming conference as stepping up an crucial position in "global climate discussions".
The King and Prince of Wales, making a joint entrance in the royal vehicle, were introduced to guests including conservation experts, scientists, climate change campaigners, foreign representatives and politicians.
This involvement featured addresses together with French leader 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 UN meeting will coincide with the the royal's Earthshot environmental awards, which will conclude in the Brazilian city the day before he joins the COP summit on the sixth of November.
Recently the prince referred to the prize competitors as "modern-day pioneers".
The monarch has been a key figure at past COP meetings, giving the opening address in the United Arab Emirates for the 28th Conference of Parties, including the observation: "We are custodians of the planet, not its owners".
"Throughout my life I've dedicated a large proportion of my life trying to alert people to the critical dangers challenging our world over global warming, environmental shifts and ecological decline," the sovereign addressed participants.