Alarmed by over grazing of meadows, logging of giant sequoia, and other damage, Muir changed from being a promoter and scientist to an advocate for further protection.[54] He persuaded many influential people to camp with him in the area, such as Ralph Waldo Emerson in 1871.[55] Muir tried to convince his guests that the entire area should be under federal protection. None of his guests through the 1880s could do much for Muir's cause, except for Robert Underwood Johnson, editor of Century Magazine. Through Johnson, Muir had a national audience for his writing and a highly motivated and crafty congressional lobbyist.[56]