Earth Day: History & Biographies
Updated February 21, 2017 | Factmonster Staff 
History & Biographies
Take a look at the history of the environmental movement and read biographies of pioneers in the field.
- Environmental Milestones Timeline
- Rachel Carson
- George Grinnell
- William Hornaday
- Aldo Leopold
- Wangari Muta Maathai
- John Muir
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