Maybe I just read your post wrong but do you have something against environmentalist and that kind of thinking? I sure hope you realize he's not the only one who's had that theme recurrent in his works. I don't see anything wrong with that at all. It's not a bad thing to think of the world's envrionmental future when you consider polution levels. Hayao Miyazaki must be the ultimate tree-hugging hippie to you if it bothers you that much. Alot of writers and artist ahve recurrent themes in their works. This is no different. (I know I've been told I ahev too much death and destruction in mine)
As someone who didn't watch Earth Girl Arjuna, but watched Macross Zero, I think the problem with Kawamori is he just wants to show environmentalism at all cost in his series.
Not like environmentalism is bad itself. It's bad when, instead of setting an story where nature has a helluva influence or is even the basis for the story (just like what Miyazaki has been doing for decades), you just shove it down the audience's throats, and not being subtle at all.
If you watch the 4th episode of Macross Zero, the whole forest scene is irritating. In the middle of a prosecution, the characters start the whole "progress is evil", "luv da forest" and "ohhhh, fireflies glow when we sing" psalms, and for the first time in the series, I wanted the doctor to start talking again about protoculture. Now, consider that whole propaganda was to be lost in the story of SDF Macross, the girl's hate to foreigners had a deeper basis than pollution and try to guess why there were *minutes* of plot lost there.
Perhaps if I was 6 to 12 years old I'd learn something. Being 23 and having the average knowledge about ecology, I found the whole nature subplot in Zero totally superfluous and forced. After all, unlike Mononoke or Nausicaa, the plot doesn't even show the slightest need for it.