So You Want to Be a Wizard by Diane Duane.
This is a book/series where the wizards are all working against entropy, at scales from the small and personal (taking care of possessions, being patient with others) to the enormous (shepherding new sentients, saving a planet). And, as the series go on, the choices aren't easy or costless.
Plus, this is the oath you take to be a wizard:
In Life's name and for Life's sake, I say that I will use the Art for nothing but the service of that Life. I will guard growth and ease pain. I will fight to preserve what grows and lives well in its own way; and I will change no object or creature unless its growth and life, or that of the system of which it is part, are threatened. To these ends, in the practice of my Art, I will put aside fear for courage, and death for life, when it is right to do so -- till Universe's end.
Hi Less Wrong,
I've got the opportunity to promote books and other forms of content to a largely teenage audience. I'm looking for some good book recommendations and recommendations for a limited amount of other media (websites, movies, etc) that will spread awareness of positive ideas and issues in the world, while still being entertaining to the target audience. HPMOR comes to mind, and although I don't think its main focus is to promote an issue to readers, it is an excellent choice because it is well ranked, promotes rationality which can directly help readers, and is completely free to read online. Recommendations don't have to be free, but that is a very important factor.
Thanks everyone!
Edit: Thanks everyone for your contributions. I realize I was being a little too vague, I think content that promotes ethical/altruistic behavior is mainly what I am looking for, either inspiring it with fiction or causing motivation for it with nonfiction. I am looking for free web content, although paid content recommendations are also appreciated. This is for a general youth audience, not a club or any sort of interest group.