Fans of Prince Harry and Meghan Markle launched an important mission Wednesday.

The #SussexGreatForest campaign has been set up to honour Harry and Meghan’s commitment to conservation, aiming to get 10,000 trees planted and donated around the globe.

Social media accounts set up with the name confirmed the campaign was being run in celebration of World Children’s Day on Nov. 20.

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The tagline read, “Plant a tree, plant hope.”

The campaign comes after Harry, who recently launched his eco-friendly travel initiative Travalyst, said during his and Meghan’s South Africa tour in September, “Conservation used to be a specialist area, driven 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.”

The first trees have already been planted, with the Sussex Great Forest Twitter profile sharing an array of snaps.