As far as this Sierra Club vs. Geocachers stuff is concerned, it seems to me that with the exception of a few vocal paranoids, we're mostly on the same page.
Rather than recap and rebut anything that's been said in opposition to our hobby, I went to www.sierraclub.org and signed up for a membership. Why not? I believe in their philosophy. I enjoy the outdoors and believe in protecting the environment. I know that our hobby is, and can continue to be, enjoyed responsibly. -Ethan