I don't see those utopias as some high tech societies. Their technology is only a doll linear extension of the today enviro technologies. A dream of some moderate Green, perhaps. Not an ultra-tech at all!

To become an immortal posthuman or something in line with that, that could be labeled as a (medium range) high tech of the future. But this is in a deep conflict with the Green vision which wants us to be born and to die like every other decent animal, until Mother Nature decides to wipe us all out. Meantime, we are obliged to manufacture some eco friendly filters and such crap.

Greens (as Nazis) have values bigger than our civilized life. For the Greens it's the beloved Mother Nature, not at all degraded by us. For the Nazis it's some half naked warriors from the myths, racially pure, living in a pristine fatherland with some Roman architecture added.

Both are retro movements, two escapes to the legendary past, from the evil civilization of today.