The National Trust was a human organisation dedicated to preserving the Earth and everything on it. They owned many natural areas.
The National Trust kept a model of Buckingham Palace available for public consumption. (TV: The Beast Below)
In the year 5.5/Apple/26, Ezekiel Lethebridge-Stuart was the President of the National Trust. (PROSE: Legacies) The National Trust set up gravity satellites to hold back the sun's expansion and restored the Earth to its "classic state". In the same year they ran out of money, so they let the sun destroy the Earth. (TV: The End of the World) Later that year Ezekeil, and his wife Dorcas Lethebridge-Stuart became one of the founders of New Earth. (PROSE: Legacies)
Melanie Bush described the Galactic Heritage as "a militarised, spacefaring National Trust". (AUDIO: The High Price of Parking)