The scene: a Manhattan art-house theater. The cause: a campaign against the gas drilling process known as fracking that’s being led by more than 100 celebrities, including Yoko Ono, Sean Lennon, Robert Redford, Mark Ruffalo and Mario Batali.

Outside, demonstrators in hazmat suits circle the theater. Inside, actress Scarlett Johansson attends a benefit screening of “Gasland,” the documentary film that has become the movement’s manifesto. Johansson tells The Associated Press that her “Avengers” co-star Ruffalo introduced her to the cause, and that she found the film “incredibly shocking.”

The campaign has galvanized hundreds of thousands of followers, but as with many activist causes, the facts can get drowned out by the glitz. Now, some experts are asking whether the celebrities are enlightened advocates or NIMBYs — crying “Not in my backyard!” — even as their privileged lives remain entwined, however ruefully, with fossil fuels.