Tree-hugger: A person who advocates changes in current practices or conditions through radical intervention ~ in this case, chaining themselves to a tree to prevent it from being chopped for whatever environmental cause.
In other words, the self-proclamation that you are a tree-hugger from the WWII thread in general discussion indicates that you are willing to put your own life in a dangerous position (such as tree-huggers normally would do) because you value the life of a spotted owl nesting in it, or you want to make sure trees with a specific type of gum aren’t wiped out, etc.
That is the kind of tree hugging that you’re speaking of, isn’t it? Or are you making a generalization that you fall in lock-step with the Green Peace, PETA, it’s-okay-to-kill-human-babies-if-they-inconvenience-you-but-not-okay-to-chop-a-tree imbeciles?