Reality has a decidedly left-leaning bias.
As does smug, self-congratulatory solipsism.
Adding to the excellent selections already offered:
- "Alas, Babylon" by Pat Frank: yes, it's a bit dated, but offers a compelling view of life after a nuclear war, and covers interesting topics of societal breakdown, rediscovery of pre-modern techniques for survival, etc. I think it was pretty popular on high school reading lists during the Cold War.
- "Inherit the Stars" by James Hogan: a fascinating portrayal of how the scientific method is applied to understand new discoveries, and a great page-turner to boot
- "The Sword of Shannara" by Terry Brooks: infinitely more readable than the Lord of the Rings series from which it borrows heavily, this is an exemplary entry in the fantasy canon. Probably too long a read for a high school class, though.