Prince Harry today guest edited National Geographic's Instagram account after saying that saving was "fundamental to our survival".
The Duke of Sussex will manage the magazine's Instagram account, which has 123 million followers, during his official tour of South Africa.
It is part of the social media campaign Search Up, which raises awareness of the role of trees in the country's eco-system.
Followers will be invited to share their tree pictures from around the world.
Prince Harry will also work with National Geographic photographers to highlight indigenous trees and share a photo taken in Livond National Park, Malawi, where he reveals two initiatives to help preserve trees in the area.
He is currently on the eighth day of his official tour of Africa.
It comes when the Duke of Sussex commented in the Daily Telegraph that conservation should not be dismissed as "hippie".
He told the paper that people need to overcome "greed, apathy and selfishness" to save the planet.
"This may sound like a hippie to some.
"But we cannot afford to have 'them or us' mentality. Humans and animals and their habitats need to coexist fundamentally or in the next 10 years our problems around the world will become even more unmanageable.
"Nature teaches us about the importance of the circular system, one where nothing goes to waste and everything plays a role.
"If we get involved, instead of working with it, the system will break down.
"Conservation was once a specialized area, led by science.
"But now it is fundamental to our survival and we must overcome greed, apathy and selfishness if we are to make real progress."
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Earlier this year, the Duchess of Sussex edited a Vogue edition highlighting female "gearboxes" and interviewing former first lady Michelle Obama.
She was heavily criticized for her guest, though many copyrights, including Kate Middleton and Prince Charles, had previously collaborated with media organizations.