The Prince of Wales plans to participate in the COP30 climate summit in South America next month, as announced by royal officials.
The father and son duo made a joint appearance on Thursday evening at a gathering ahead of the environmental conference, which is planned for in the Amazonian city of Belem.
The King and Prince were in attendance at the scientific institution event, marking an rare public appearance together at a climate summit preparatory event arranged together with the UK government.
The King has been a consistent supporter of biodiversity preservation - and Prince William has inherited the mission, with his own environmental prize initiative, which will be hosted in Rio before the climate conference.
Palace insiders have characterized the Prince's participation at the next COP as assuming an crucial position in "environmental negotiations".
The monarch and his heir, making a joint entrance in the official car, were introduced to participants featuring conservation experts, researchers, climate change campaigners, diplomats and government officials.
This participation 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 in recent months.
The climate conference will dovetail with the William's personal Earthshot environmental awards, which will wrap up in the Brazilian city the day before he attends the climate conference on November 6th.
Recently the royal figure referred to the prize competitors as "heroes of our time".
The monarch has been a influential participant at earlier environmental conferences, giving the opening address in the United Arab Emirates for COP28, including the statement: "Our responsibility is to protect the world we inhabit".
"Throughout my life I've dedicated a significant amount of my life trying to raise awareness about the survival risks facing us over climate change, global temperature increases and ecological decline," the King told attendees.