Well, I for one welcome our new giant Robot overlords.
Seriously, what's with the Japanese and their obsession with robots? Is their ultimate goal to make an army of robots this size that are functional and can enslave the rest of the world? Are they really scared of Godzilla coming out of the water and attacking their cities?
As for what this has to do with environmentalism: You'd better go green or they'll sick this thing on your bee-hind. You know, I would have thought the threat of Al Gore releasing another movie was incentive enough, but what do I know.
....wait, I got it. Al Gore commissioned the Japanese to build this for him to use in his battle against Man-Bear-Pig. I knew there was a logical explanation.
The beauty of a LEGO MOC is not the elements that go into it, but the way those elements are put together.