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Henry David Thoreau
John Muir
Ellen Swallow Richards
George Washington Carver
Aldo Leopold
Rachel Carson
David Brower
Barry Commoner
Sylvia Earle
Frances Moore Lappé.
John Muir
Ellen Swallow Richards
George Washington Carver
Aldo Leopold
Rachel Carson
David Brower
Barry Commoner
Sylvia Earle
Frances Moore Lappé.