I think of the word 'alien' in the same sense that we now think of the word 'oriental' as compared to 'asian'. The word "alien", by its nature, presumes outsidedness, or a thing that is to be feared in some way, something illusive and deceptive. It is kind of odd to me that a film with a message of understanding and respect for the Earth to have alien in the title, and it is somewhat representative of the mentality expressed by the writers.
Let me say before I pick some of this apart that I really enjoyed the film and would recommend it to anyone who perhaps enjoyed "Koyaanisqatsi". Sadly, I think the people who are the intended targets of the message will be unwilling to examine this work. It is kind of preaching to the choir, but the photography combined with the dialogue makes for a compelling story.
I suppose the idea of the "she" character not wanting to be on Earth at the beginning was to show her transformation and how humanity has a likable side. However, any civilization that has the consciousness to be capable of space/time (4th/5th dimensional) travel would certainly show if anything pity and mercy on us, rather than anger and spite. There are, in fact, many ETs contacting and trying to contact us about these exact issues, and their access is not limited to fanciful movies or NASA.
One reviewer suggested that we are already doing some of what is suggested in the film. I am sorry to disagree with this optimistic appraisal of our current global situation, but let's be realistic in our evaluation of the relative power between multi-national corporations and the EPA. Invite your own extraterrestrial experience and see what happens . . .