Aldo Leopold (American Environmentalist, 1887—1948)
David Douglas (Unsorted)
David R. Brower (American Environmentalist, 1912—2000)
Donella Meadows (American Environmentalist, 1941—2001)
Garrett Hardin (American Environmentalist, 1915—2003)
Henry Walter Bates (English Environmentalist, 1825—1892)
John Muir (American Environmentalist, 1838—1914)
John Ray (English Environmentalist, 1627—1705)
Joseph Banks (English Environmentalist, 1743—1820)

Joseph Wood Krutch (American Environmentalist, 1893—1970)
Luther Burbank (American Environmentalist, 1849—1926)
Paul Hawken
Richard Leakey (Unsorted, 1944)
Roberto Burle Marx (Unsorted, 1909—1994)
Roger Tory Peterson (American Environmentalist, 1908—1996)
Will Steger (American Environmentalist)
William Bartram (American Environmentalist, 1739—1823)