Greetings Nauntilus, welcome to the forum!
If you're really concerned about being "green", the products you should keep your eye out for are the ones marked with a
high content of recycled materials and/or fast growing natural fibers (ex. pine, flax, or bamboo). Greenflooring.com has a
rating system for how green a product is, and they have a catalog of green floors available.
"Why is the only time I'm right have to be when I realize I'm wrong?"
~Nathan the Stout