The theme of environmentalism in The Lord of the Rings has been remarked by critics since the 1970s. The Hobbits' visions of Saruman's industrial hell of Isengard and Sauron's desolate polluted land of Mordor have been interpreted as comments on modern society, while the destruction of Isengard by the tree-giant Ents, and "The Scouring of the Shire" by the Hobbits, have a strong theme of restoration of the natural environment after such industrial pollution and degradation. However, Tolkien's love of trees and unspoilt nature is apparent throughout the novel.