Environmentalist Quotes and aphorisms about first John Muir John Muir John Muir ,, No traveler, whether a tree lover or not, will ever forget his first walk in a sugar-pine forest. T... John Muir ,, During my first years in the Sierra, I was ever calling on everybody within reach to admire them, b... Aldo Leopold Greta Thunburg Paul Hawken William Bartram William Bartram William Bartram