explore, enjoy, and protect the planet! (http://www.sierraclub.org/) they have giant meetings--i don't know if it's one a year or if they have regions or what--and, like, hundreds of people camping, different teachers (from among the membership) doing different kinds of courses (or whatever you call them)--canoeing and different hikes and things--which they sign up for. they get window stickers in their cars and. wear t-shirts and carry canvas bags with the logos. they donate money to environmental charities. i guess it's a kind of interest group.

my grandpa is that sort of person.