I recently saw an ad for GreenSingles.com, "where hearts and minds connect," according to their website.  Apparently they've been around since 1985, and somewhere along the line went online.

So if you're looking for "progressive singles in the environmental, vegetarian, and animal rights community and other green singles who love the outdoors, holistic living, personal growth and spirituality," then visit the website!

Or just do what I did and go to DePaul University.