There are hidden contradictions in the minds of people who "love Nature" while deploring the "artificialities" with which "Man has spoiled Nature.'" The obvious contradiction lies in their choice of words, which imply that Man and his artifacts are not part of "Nature" : but beavers and their dams are.
Robert A. HeinleinI wanted the feeling of romance and the sense of wonder I had known as a kid. I wanted the world to be what they had promised me it was going to be - instead of the tawdry, lousy fouled-up mess it is.
Robert A. Heinlein