I can think of a nonfiction book whose title would get you rapidly banned from HN. A movie was made with the same subject and title, but because it was a drama and not a documentary, it's not really fair to say the movie is an adaptation of a book. In the movie, a small group does the thing that is extremely effective.

/The Ministy for the Future/ also contains a grassroots group that does something implementable by individuals and extremely effective.