[snip]Try "Ecotopia" by Ernest Callenbach. This is a favorite of Earth Firsters! and other deep ecologists.
Then there's my personal favorite, "Night of the Living Dead," by John Russo (novelization of the film). While this is not technically a utopian story, what else would you call a world in which everything has fallen apart and the protagonists get to run around blasting carnivorous zombies?