The threat of overindustrialization, and more...

J.R.R. Tolkein created a world with several languages (he was a Linguist) and a broad history. Much of that he created while fighting in a World War. From all this came his stories. And because of the thorough base he started with, the story is rich and engrossing. But I've oversimplified the matter far too much. Read it, you won't be disappointed.