As we mark John Muir Day, April 21, Peter Pearson, Chair of the John Muir Trust, invites hillwalkers and mountaineers to get involved with the organisation that honours his name. “Who wouldn’t be a mountaineer! Up here all the world’s prizes seem nothing,” noted John Muir in My First Summer in the Sierra, a collection of journal entries describing his 1869 adventures in the magical mountain wilderness of Yosemite. Muir would later rise to fame in the USA as a writer, scientist and campaigner. He is today hailed as the founding father of the modern conservation movement, and the inspiration…