Australia seems to be far ahead of the U.S. in terms of producing science fiction movies with content. Alien Visitor (originally released as Epsilon in 1997) makes blunt statements about our civilization's disregard for nature and the environment. One reason why such a film is possible in Australia may be because that country has already begun to feel the impact of our pollution (the same reason why permaculture caught on there much sooner).
Review: I Wish More Science Fiction Films Were Like This by RP
I Wish More Science Fiction Films Were Like This