A Sand County Almanac
Leopold articulated the "land ethic," the idea that humans are members of the ecological community, not its masters. His description of a year on a Wisconsin farm and his philosophical essays on conservation founded the field of environmental ethics. The most quietly radical argument in American environmental literature.
Readers arrive for the land ethic and find it occupies a few dozen pages at the back of a year of goose-watching; the philosophy is asserted in aphorisms, not argued, and environmental thinkers have spent decades filling in the argument. Leopold shot the wolf whose dying green fire converted him while working in government predator control. The book is a repentance that stays quiet about how long the sinning lasted.
The case for it and the rest of the canon open with Pro.
