Edward Abbey called The Monkey Wrench Gang a "comic extravaganza," which it is, although one with a clear, serious message: to protect the American wilderness from the forces of commercial enterprise. The story centers on George Hayduke, an ex-Green Beret and Vietnam vet, who returns to the Southwestern desert after the war to find his beloved canyons and rivers threatened by industrial development. On a whitewater rafting trip down the Colorado River,...