Environmentalism is a form of existentialism rooted in 1800s Germany that was aimed directly at the Judeo-Christian worldview.
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The two primary Germanic precursors of modern existentialism were Nietzsche and Kierkegaard. And I think most would suggest that they track closer to nihilism than existentialism.
I would be very interested in your research tying either one of these guys into the environmental movement as it exists today as part of Agenda 21, or any radical environmential movement for that matter.
The author/presenter has already done this on the American Thinker - http://www.americanthinker.com/2011/11/friedrich_nietzsche_his_proto-nazi_eco-fascism.html.
Nietzsche himself would not agree that he was a nihilist, but the difference between nihilism and some shades of existentialism, especially of the environmental variety, are not all that great anyway ...
Schopenhauer, who preceded Nietzsche, helped convert Goethe’s Romanticism into a tougher minded environmental existentialism, which Nietzsche emphasized even more with his “will to power” earth based superman values rooted in on biology and instinct rather than heavenly Judeo-Christian values. Schopenhauer is often considered the father of environmental ethics, and one of the original animal right gurus. He was an extremely anti-Semitic, and was drumroll ... the Fuhrer’s favorite philosopher. Nietzsche was number 2 on the Fuhrer’s list.