
I support these more colorful displays of "loyalty to Mother Earth", as long as there is no harm done to property or people; the example of somebody living in a tree to rescue (or delay) it from being cut down is a very sound and peaceful example of this because the only law being broken, generally, is trespassing. Earth First's monkey wrenching seems pretty harmless, but apparently the group has turned more violent in recent years.
Many of these environmental demonstration groups are seen in a very negative light, mainly due to the fact that their cause is usually picked up in the media when it causes great damage and destruction. A group of note is the Earth Liberation Front (or ELF), who are seem as domestic terrorists in the eyes of the federal government. They torch heavy machinery, SUVs, and luxury homes; anything that will cause determent to the environment in their eyes. The picture at the top is from 2008 when ELF torched an entire subdivision of "green built" homes, and left the message, "Built Green? Nope black! McMansions in RCDs r not green. ELF."
Although it is not as peaceful of a demonstration as Aldo Leopold might approve of, group like Earth First and ELF are standing up for a land ethic: they believe that nature, our natural resources, and the environment are members of the community just like any human being. I can't pinpoint a specific cause that I would stand up for to an extreme level, but I would risk arrest to stand up for something I believe in; I certainly don't want to get label a terrorist for it, though.

