For an overview, see: Michael Egan, "Subaltern Environmentalism
in the United States: A Historiographic Review," Environment and History, 8 (2002), pp.
But our several environmentalisms are learning from their interactions, and it is possible that the lessons will be good for them all.
None of our several environmentalisms will go away, and none should, but they are all better off with the recognition that the environment is very much a political, cultural, and human affair.
Still a guiding spirit of the Sierra Club and the soul of the Wilderness Society and many regional groups, this environmentalism arises from love of beautiful landscapes: the highest mountains, deepest canyons, and most ancient forests.
Muir's environmentalism contains the idea that our true selves await us in the wild.